21021212102110 has 128 divisors (see below), whose sum is σ = 43141402773504. Its totient is φ = 7300077058560.

The previous prime is 21021212102101. The next prime is 21021212102113. The reversal of 21021212102110 is 1120121212012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021212102113) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6921701512 + ... + 6921704548.

It is an arithmetic number, because the mean of its divisors is an integer number (337042209168).

Almost surely, 2^{21021212102110} is an apocalyptic number.

21021212102110 is an abundant number, since it is smaller than the sum of its proper divisors (22120190671394).

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

21021212102110 is a wasteful number, since it uses less digits than its factorization.

21021212102110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6538.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21021212102110 its reverse (1120121212012), we get a palindrome (22141333314122).

The spelling of 21021212102110 in words is "twenty-one trillion, twenty-one billion, two hundred twelve million, one hundred two thousand, one hundred ten".