21021000000102 has 24 divisors (see below), whose sum is σ = 47942631579960. Its totient is φ = 6638210526240.

The previous prime is 21021000000067. The next prime is 21021000000113. The reversal of 21021000000102 is 20100000012012.

It is a Harshad number since it is a multiple of its sum of digits (9).

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 11 ways as a sum of consecutive naturals, for example, 30732455799 + ... + 30732456482.

It is an arithmetic number, because the mean of its divisors is an integer number (1997609649165).

Almost surely, 2^{21021000000102} is an apocalyptic number.

21021000000102 is an abundant number, since it is smaller than the sum of its proper divisors (26921631579858).

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

21021000000102 is a wasteful number, since it uses less digits than its factorization.

21021000000102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61464912308 (or 61464912305 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21021000000102 its reverse (20100000012012), we get a palindrome (41121000012114).

The spelling of 21021000000102 in words is "twenty-one trillion, twenty-one billion, one hundred two", and thus it is an aban number.