21021212022 has 32 divisors (see below), whose sum is σ = 42560888832. Its totient is φ = 6920949504.

The previous prime is 21021211987. The next prime is 21021212041. The reversal of 21021212022 is 22021212012.

It is a junction number, because it is equal to n+sod(n) for n = 21021211992 and 21021212010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256843 + ... + 328649.

It is an arithmetic number, because the mean of its divisors is an integer number (1330027776).

Almost surely, 2^21021212022 is an apocalyptic number.

21021212022 is an abundant number, since it is smaller than the sum of its proper divisors (21539676810).

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

21021212022 is a wasteful number, since it uses less digits than its factorization.

21021212022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72412.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21021212022 its reverse (22021212012), we get a palindrome (43042424034).

The spelling of 21021212022 in words is "twenty-one billion, twenty-one million, two hundred twelve thousand, twenty-two".