21021200120102 has 64 divisors (see below), whose sum is σ = 38979505152000. Its totient is φ = 8279422905600.

The previous prime is 21021200120087. The next prime is 21021200120117. The reversal of 21021200120102 is 20102100212012.

It is an interprime number because it is at equal distance from previous prime (21021200120087) and next prime (21021200120117).

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 202170227 + ... + 202274177.

It is an arithmetic number, because the mean of its divisors is an integer number (609054768000).

Almost surely, 2^{21021200120102} is an apocalyptic number.

21021200120102 is a deficient number, since it is larger than the sum of its proper divisors (17958305031898).

21021200120102 is a wasteful number, since it uses less digits than its factorization.

21021200120102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108861.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21021200120102 its reverse (20102100212012), we get a palindrome (41123300332114).

The spelling of 21021200120102 in words is "twenty-one trillion, twenty-one billion, two hundred million, one hundred twenty thousand, one hundred two".