21235252110 has 16 divisors (see below), whose sum is σ = 50964605136. Its totient is φ = 5662733888.

The previous prime is 21235252079. The next prime is 21235252127. The reversal of 21235252110 is 1125253212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353920839 + ... + 353920898.

It is an arithmetic number, because the mean of its divisors is an integer number (3185287821).

Almost surely, 2^21235252110 is an apocalyptic number.

21235252110 is an abundant number, since it is smaller than the sum of its proper divisors (29729353026).

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

21235252110 is a wasteful number, since it uses less digits than its factorization.

21235252110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707841747.

The product of its (nonzero) digits is 1200, while the sum is 24.

It can be divided in two parts, 212352 and 52110, that added together give a palindrome (264462).

The spelling of 21235252110 in words is "twenty-one billion, two hundred thirty-five million, two hundred fifty-two thousand, one hundred ten".