21157142592 has 28 divisors (see below), whose sum is σ = 55978273616. Its totient is φ = 7052380800.

The previous prime is 21157142569. The next prime is 21157142597. The reversal of 21157142592 is 29524175112.

It is a self number, because there is not a number n which added to its sum of digits gives 21157142592.

It is not an unprimeable number, because it can be changed into a prime (21157142597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55096534 + ... + 55096917.

Almost surely, 2^21157142592 is an apocalyptic number.

It is an amenable number.

21157142592 is an abundant number, since it is smaller than the sum of its proper divisors (34821131024).

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

21157142592 is a wasteful number, since it uses less digits than its factorization.

21157142592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110193466 (or 110193456 counting only the distinct ones).

The product of its digits is 50400, while the sum is 39.

The spelling of 21157142592 in words is "twenty-one billion, one hundred fifty-seven million, one hundred forty-two thousand, five hundred ninety-two".