21102102010 has 32 divisors (see below), whose sum is σ = 42865718400. Its totient is φ = 7408887360.

The previous prime is 21102101987. The next prime is 21102102041. The reversal of 21102102010 is 1020120112.

It is a Harshad number since it is a multiple of its sum of digits (10).

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, 3304350 + ... + 3310729.

It is an arithmetic number, because the mean of its divisors is an integer number (1339553700).

Almost surely, 2^21102102010 is an apocalyptic number.

21102102010 is an abundant number, since it is smaller than the sum of its proper divisors (21763616390).

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

21102102010 is a wasteful number, since it uses less digits than its factorization.

21102102010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6615126.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21102102010 its reverse (1020120112), we get a palindrome (22122222122).

The spelling of 21102102010 in words is "twenty-one billion, one hundred two million, one hundred two thousand, ten".