21034523157 has 8 divisors (see below), whose sum is σ = 28047456576. Its totient is φ = 14022302592.

The previous prime is 21034523143. The next prime is 21034523179. The reversal of 21034523157 is 75132543012.

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

It is not a de Polignac number, because 21034523157 - 2²⁴ = 21017745941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034503157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105073 + ... + 230454.

It is an arithmetic number, because the mean of its divisors is an integer number (3505932072).

Almost surely, 2^21034523157 is an apocalyptic number.

It is an amenable number.

21034523157 is a deficient number, since it is larger than the sum of its proper divisors (7012933419).

21034523157 is a wasteful number, since it uses less digits than its factorization.

21034523157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356427.

The product of its (nonzero) digits is 25200, while the sum is 33.

The spelling of 21034523157 in words is "twenty-one billion, thirty-four million, five hundred twenty-three thousand, one hundred fifty-seven".