21157634022 has 64 divisors (see below), whose sum is σ = 49455636480. Its totient is φ = 5908468896.

The previous prime is 21157634011. The next prime is 21157634063. The reversal of 21157634022 is 22043675112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1546729 + ... + 1560347.

It is an arithmetic number, because the mean of its divisors is an integer number (772744320).

Almost surely, 2^21157634022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21157634022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24727818240).

21157634022 is an abundant number, since it is smaller than the sum of its proper divisors (28298002458).

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

21157634022 is a wasteful number, since it uses less digits than its factorization.

21157634022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14465.

The product of its (nonzero) digits is 20160, while the sum is 33.

The spelling of 21157634022 in words is "twenty-one billion, one hundred fifty-seven million, six hundred thirty-four thousand, twenty-two".