21021022110 has 32 divisors (see below), whose sum is σ = 55036858752. Its totient is φ = 5096005280.

The previous prime is 21021022103. The next prime is 21021022129. The reversal of 21021022110 is 1122012012.

It is a Curzon number.

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, 31849704 + ... + 31850363.

It is an arithmetic number, because the mean of its divisors is an integer number (1719901836).

Almost surely, 2^21021022110 is an apocalyptic number.

21021022110 is an abundant number, since it is smaller than the sum of its proper divisors (34015836642).

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

21021022110 is a wasteful number, since it uses less digits than its factorization.

21021022110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63700088.

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

Adding to 21021022110 its reverse (1122012012), we get a palindrome (22143034122).

The spelling of 21021022110 in words is "twenty-one billion, twenty-one million, twenty-two thousand, one hundred ten".