21211102111212 has 108 divisors (see below), whose sum is σ = 59474657557224. Its totient is φ = 6367310127360.

The previous prime is 21211102111151. The next prime is 21211102111217. The reversal of 21211102111212 is 21211120111212.

It is a happy number.

21211102111212 is a `hidden beast` number, since 21 + 211 + 10 + 211 + 1 + 212 = 666.

It is a super-2 number, since 2×21211102111212² (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 not an unprimeable number, because it can be changed into a prime (21211102111217) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 42267318 + ... + 42766205.

It is an arithmetic number, because the mean of its divisors is an integer number (550691273678).

Almost surely, 2^{21211102111212} is an apocalyptic number.

It is an amenable number.

21211102111212 is an abundant number, since it is smaller than the sum of its proper divisors (38263555446012).

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

21211102111212 is a wasteful number, since it uses less digits than its factorization.

21211102111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85033600 (or 85033582 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21211102111212 its reverse (21211120111212), we get a palindrome (42422222222424).

The spelling of 21211102111212 in words is "twenty-one trillion, two hundred eleven billion, one hundred two million, one hundred eleven thousand, two hundred twelve".