21000002010102 has 32 divisors (see below), whose sum is σ = 46670818053600. Its totient is φ = 6999378632064.

The previous prime is 21000002010077. The next prime is 21000002010131. The reversal of 21000002010102 is 20101020000012.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16665327 + ... + 17881082.

It is an arithmetic number, because the mean of its divisors is an integer number (1458463064175).

Almost surely, 2^{21000002010102} is an apocalyptic number.

21000002010102 is an abundant number, since it is smaller than the sum of its proper divisors (25670816043498).

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

21000002010102 is a wasteful number, since it uses less digits than its factorization.

21000002010102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34557677 (or 34557671 counting only the distinct ones).

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

Adding to 21000002010102 its reverse (20101020000012), we get a palindrome (41101022010114).

The spelling of 21000002010102 in words is "twenty-one trillion, two million, ten thousand, one hundred two".