21010121022 has 32 divisors (see below), whose sum is σ = 45890277120. Its totient is φ = 6359757120.

The previous prime is 21010120951. The next prime is 21010121137. The reversal of 21010121022 is 22012101012.

It is a junction number, because it is equal to n+sod(n) for n = 21010120989 and 21010121007.

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, 112543 + ... + 233850.

It is an arithmetic number, because the mean of its divisors is an integer number (1434071160).

Almost surely, 2^21010121022 is an apocalyptic number.

21010121022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21010121022 is an abundant number, since it is smaller than the sum of its proper divisors (24880156098).

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

21010121022 is a wasteful number, since it uses less digits than its factorization.

21010121022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347328.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21010121022 its reverse (22012101012), we get a palindrome (43022222034).

The spelling of 21010121022 in words is "twenty-one billion, ten million, one hundred twenty-one thousand, twenty-two".