21221110202110 has 256 divisors, whose sum is σ = 48685429997568. Its totient is φ = 6480972288000.

The previous prime is 21221110202087. The next prime is 21221110202113. The reversal of 21221110202110 is 1120201112212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221110202113) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2798507379 + ... + 2798514961.

It is an arithmetic number, because the mean of its divisors is an integer number (190177460928).

Almost surely, 2^{21221110202110} is an apocalyptic number.

21221110202110 is an abundant number, since it is smaller than the sum of its proper divisors (27464319795458).

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

21221110202110 is a wasteful number, since it uses less digits than its factorization.

21221110202110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8459.

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

Adding to 21221110202110 its reverse (1120201112212), we get a palindrome (22341311314322).

The spelling of 21221110202110 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred ten million, two hundred two thousand, one hundred ten".