21000210102 has 48 divisors (see below), whose sum is σ = 47159077680. Its totient is φ = 6748370496.

The previous prime is 21000210059. The next prime is 21000210157. The reversal of 21000210102 is 20101200012.

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 23 ways as a sum of consecutive naturals, for example, 72048 + ... + 217235.

It is an arithmetic number, because the mean of its divisors is an integer number (982480785).

Almost surely, 2^21000210102 is an apocalyptic number.

21000210102 is an abundant number, since it is smaller than the sum of its proper divisors (26158867578).

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

21000210102 is a wasteful number, since it uses less digits than its factorization.

21000210102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289437 (or 289434 counting only the distinct ones).

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

Adding to 21000210102 its reverse (20101200012), we get a palindrome (41101410114).

The spelling of 21000210102 in words is "twenty-one billion, two hundred ten thousand, one hundred two".