21021210222110 has 64 divisors (see below), whose sum is σ = 44014518595584. Its totient is φ = 7079540227200.

The previous prime is 21021210222083. The next prime is 21021210222151. The reversal of 21021210222110 is 1122201212012.

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 31 ways as a sum of consecutive naturals, for example, 6456857 + ... + 9150596.

It is an arithmetic number, because the mean of its divisors is an integer number (687726853056).

Almost surely, 2^{21021210222110} is an apocalyptic number.

21021210222110 is an abundant number, since it is smaller than the sum of its proper divisors (22993308373474).

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

21021210222110 is a wasteful number, since it uses less digits than its factorization.

21021210222110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15607809.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21021210222110 its reverse (1122201212012), we get a palindrome (22143411434122).

The spelling of 21021210222110 in words is "twenty-one trillion, twenty-one billion, two hundred ten million, two hundred twenty-two thousand, one hundred ten".