21021202110 has 32 divisors (see below), whose sum is σ = 50525897760. Its totient is φ = 5597319168.

The previous prime is 21021202087. The next prime is 21021202171. The reversal of 21021202110 is 1120212012.

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, 500395 + ... + 540774.

It is an arithmetic number, because the mean of its divisors is an integer number (1578934305).

Almost surely, 2^21021202110 is an apocalyptic number.

21021202110 is an abundant number, since it is smaller than the sum of its proper divisors (29504695650).

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

21021202110 is a wasteful number, since it uses less digits than its factorization.

21021202110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041852.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21021202110 its reverse (1120212012), we get a palindrome (22141414122).

The spelling of 21021202110 in words is "twenty-one billion, twenty-one million, two hundred two thousand, one hundred ten".