21021120202212 has 36 divisors (see below), whose sum is σ = 57224160551740. Its totient is φ = 6468036985152.

The previous prime is 21021120202171. The next prime is 21021120202237. The reversal of 21021120202212 is 21220202112012.

It is a happy number.

21021120202212 is a `hidden beast` number, since 21 + 0 + 211 + 20 + 202 + 212 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5692203875556 + 15328916326656 = 2385834^2 + 3915216^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22458461287 + ... + 22458462222.

Almost surely, 2^{21021120202212} is an apocalyptic number.

It is an amenable number.

21021120202212 is an abundant number, since it is smaller than the sum of its proper divisors (36203040349528).

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

21021120202212 is a wasteful number, since it uses less digits than its factorization.

21021120202212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44916923532 (or 44916923527 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21021120202212 its reverse (21220202112012), we get a palindrome (42241322314224).

The spelling of 21021120202212 in words is "twenty-one trillion, twenty-one billion, one hundred twenty million, two hundred two thousand, two hundred twelve".