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BaseRepresentation
bin1001101001010100110001…
…01111100011101000101100
32210002202120210200112210200
410310222120233203220230
510240010323421024322
6113040125552233500
74316311051431111
oct464523057435054
983082523615720
1021211111111212
116838644282470
122466a3223b890
13bab27882a159
145348a22da908
1526bb3a25c8ac
hex134a98be3a2c

21211111111212 has 72 divisors (see below), whose sum is σ = 60072090313872. Its totient is φ = 6253890249600.

The previous prime is 21211111111199. The next prime is 21211111111217.

It can be divided in two parts, 2121111 and 1111212, that added together give a palindrome (3232323).

21211111111212 is a `hidden beast` number, since 21 + 211 + 111 + 111 + 212 = 666.

21211111111212 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×212111111112122 (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21211111111217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 723815239 + ... + 723844542.

Almost surely, 221211111111212 is an apocalyptic number.

21211111111212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21211111111212 is an abundant number, since it is smaller than the sum of its proper divisors (38860979202660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21211111111212 is a wasteful number, since it uses less digits than its factorization.

21211111111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447659839 (or 1447659834 counting only the distinct ones).

The product of its digits is 16, while the sum is 18.

The spelling of 21211111111212 in words is "twenty-one trillion, two hundred eleven billion, one hundred eleven million, one hundred eleven thousand, two hundred twelve".