21012002121022 has 16 divisors (see below), whose sum is σ = 36405821857392. Its totient is φ = 8989091816320.

The previous prime is 21012002121017. The next prime is 21012002121041. The reversal of 21012002121022 is 22012120021012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21012002120987 and 21012002121005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28090911553 + ... + 28090912300.

It is an arithmetic number, because the mean of its divisors is an integer number (2275363866087).

Almost surely, 2^{21012002121022} is an apocalyptic number.

21012002121022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21012002121022 is a deficient number, since it is larger than the sum of its proper divisors (15393819736370).

21012002121022 is a wasteful number, since it uses less digits than its factorization.

21012002121022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56181823883.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21012002121022 its reverse (22012120021012), we get a palindrome (43024122142034).

The spelling of 21012002121022 in words is "twenty-one trillion, twelve billion, two million, one hundred twenty-one thousand, twenty-two".