21158024797 has 24 divisors (see below), whose sum is σ = 26278659456. Its totient is φ = 16679722176.

The previous prime is 21158024761. The next prime is 21158024801. The reversal of 21158024797 is 79742085112.

It is not a de Polignac number, because 21158024797 - 2²⁷ = 21023807069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21158024707) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 295408 + ... + 359974.

It is an arithmetic number, because the mean of its divisors is an integer number (1094944144).

Almost surely, 2^21158024797 is an apocalyptic number.

It is an amenable number.

21158024797 is a deficient number, since it is larger than the sum of its proper divisors (5120634659).

21158024797 is a wasteful number, since it uses less digits than its factorization.

21158024797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64877 (or 64864 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 46.

The spelling of 21158024797 in words is "twenty-one billion, one hundred fifty-eight million, twenty-four thousand, seven hundred ninety-seven".