21120822437 has 16 divisors (see below), whose sum is σ = 24853855488. Its totient is φ = 17694780480.

The previous prime is 21120822433. The next prime is 21120822439. The reversal of 21120822437 is 73422802112.

It is not a de Polignac number, because 21120822437 - 2² = 21120822433 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120822433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32813 + ... + 208130.

It is an arithmetic number, because the mean of its divisors is an integer number (1553365968).

Almost surely, 2^21120822437 is an apocalyptic number.

It is an amenable number.

21120822437 is a deficient number, since it is larger than the sum of its proper divisors (3733033051).

21120822437 is a wasteful number, since it uses less digits than its factorization.

21120822437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241580.

The product of its (nonzero) digits is 10752, while the sum is 32.

The spelling of 21120822437 in words is "twenty-one billion, one hundred twenty million, eight hundred twenty-two thousand, four hundred thirty-seven".