21497927567 has 8 divisors (see below), whose sum is σ = 21579452160. Its totient is φ = 21416555160.

The previous prime is 21497927551. The next prime is 21497927573. The reversal of 21497927567 is 76572979412.

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

It is a cyclic number.

It is not a de Polignac number, because 21497927567 - 2⁴ = 21497927551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21497927267) 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, 249092 + ... + 324102.

It is an arithmetic number, because the mean of its divisors is an integer number (2697431520).

Almost surely, 2^21497927567 is an apocalyptic number.

21497927567 is a deficient number, since it is larger than the sum of its proper divisors (81524593).

21497927567 is an equidigital number, since it uses as much as digits as its factorization.

21497927567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76093.

The product of its digits is 13335840, while the sum is 59.

The spelling of 21497927567 in words is "twenty-one billion, four hundred ninety-seven million, nine hundred twenty-seven thousand, five hundred sixty-seven".