21557302934 has 8 divisors (see below), whose sum is σ = 32541916368. Its totient is φ = 10709997480.

The previous prime is 21557302913. The next prime is 21557302951. The reversal of 21557302934 is 43920375512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21557302891 and 21557302900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34326602 + ... + 34327229.

It is an arithmetic number, because the mean of its divisors is an integer number (4067739546).

Almost surely, 2^21557302934 is an apocalyptic number.

21557302934 is a deficient number, since it is larger than the sum of its proper divisors (10984613434).

21557302934 is a wasteful number, since it uses less digits than its factorization.

21557302934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68653990.

The product of its (nonzero) digits is 226800, while the sum is 41.

The spelling of 21557302934 in words is "twenty-one billion, five hundred fifty-seven million, three hundred two thousand, nine hundred thirty-four".