21726291792 has 40 divisors (see below), whose sum is σ = 56650811616. Its totient is φ = 7174412416.

The previous prime is 21726291791. The next prime is 21726291793. The reversal of 21726291792 is 29719262712.

It is an interprime number because it is at equal distance from previous prime (21726291791) and next prime (21726291793).

It is a super-2 number, since 2×21726291792² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21726291791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2109963 + ... + 2120234.

Almost surely, 2^21726291792 is an apocalyptic number.

It is an amenable number.

21726291792 is an abundant number, since it is smaller than the sum of its proper divisors (34924519824).

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

21726291792 is a wasteful number, since it uses less digits than its factorization.

21726291792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4230315 (or 4230309 counting only the distinct ones).

The product of its digits is 381024, while the sum is 48.

The spelling of 21726291792 in words is "twenty-one billion, seven hundred twenty-six million, two hundred ninety-one thousand, seven hundred ninety-two".