21101020010 has 32 divisors (see below), whose sum is σ = 43415229312. Its totient is φ = 7233399360.

The previous prime is 21101019959. The next prime is 21101020051. The reversal of 21101020010 is 1002010112.

It is a self number, because there is not a number n which added to its sum of digits gives 21101020010.

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, 448925 + ... + 493695.

It is an arithmetic number, because the mean of its divisors is an integer number (1356725916).

Almost surely, 2^21101020010 is an apocalyptic number.

21101020010 is an abundant number, since it is smaller than the sum of its proper divisors (22314209302).

21101020010 is a wasteful number, since it uses less digits than its factorization.

21101020010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51518.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21101020010 its reverse (1002010112), we get a palindrome (22103030122).

The spelling of 21101020010 in words is "twenty-one billion, one hundred one million, twenty thousand, ten".