21012002022102 has 128 divisors (see below), whose sum is σ = 54479898009600. Its totient is φ = 5362864536960.

The previous prime is 21012002022101. The next prime is 21012002022197. The reversal of 21012002022102 is 20122020021012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012002022101) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 11838013 + ... + 13496760.

It is an arithmetic number, because the mean of its divisors is an integer number (425624203200).

Almost surely, 2^{21012002022102} is an apocalyptic number.

21012002022102 is an abundant number, since it is smaller than the sum of its proper divisors (33467895987498).

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

21012002022102 is a wasteful number, since it uses less digits than its factorization.

21012002022102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25334843 (or 25334829 counting only the distinct ones).

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

Adding to 21012002022102 its reverse (20122020021012), we get a palindrome (41134022043114).

The spelling of 21012002022102 in words is "twenty-one trillion, twelve billion, two million, twenty-two thousand, one hundred two".