21010200102 has 24 divisors (see below), whose sum is σ = 46752428736. Its totient is φ = 6814118736.

The previous prime is 21010200089. The next prime is 21010200109. The reversal of 21010200102 is 20100201012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010200109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15772758 + ... + 15774089.

It is an arithmetic number, because the mean of its divisors is an integer number (1948017864).

Almost surely, 2^21010200102 is an apocalyptic number.

21010200102 is an abundant number, since it is smaller than the sum of its proper divisors (25742228634).

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

21010200102 is a wasteful number, since it uses less digits than its factorization.

21010200102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31546892 (or 31546889 counting only the distinct ones).

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

Adding to 21010200102 its reverse (20100201012), we get a palindrome (41110401114).

The spelling of 21010200102 in words is "twenty-one billion, ten million, two hundred thousand, one hundred two".