21020002222212 has 108 divisors (see below), whose sum is σ = 61841339767116. Its totient is φ = 6002554723200.

The previous prime is 21020002222211. The next prime is 21020002222259. The reversal of 21020002222212 is 21222220002012.

21020002222212 is a `hidden beast` number, since 21 + 0 + 200 + 0 + 222 + 221 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2330428177476 + 18689574044736 = 1526574^2 + 4323144^2 .

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 (21020002222211) 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, 219198 + ... + 6487530.

Almost surely, 2^{21020002222212} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020002222212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30920669883558).

21020002222212 is an abundant number, since it is smaller than the sum of its proper divisors (40821337544904).

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

21020002222212 is a wasteful number, since it uses less digits than its factorization.

21020002222212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6270258 (or 6270246 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21020002222212 its reverse (21222220002012), we get a palindrome (42242222224224).

The spelling of 21020002222212 in words is "twenty-one trillion, twenty billion, two million, two hundred twenty-two thousand, two hundred twelve".