21716097331 has 4 divisors (see below), whose sum is σ = 21721325472. Its totient is φ = 21710869192.

The previous prime is 21716097233. The next prime is 21716097353. The reversal of 21716097331 is 13379061712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21716097331 - 2¹¹ = 21716095283 is a prime.

It is a super-2 number, since 2×21716097331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21716097371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2607835 + ... + 2616148.

It is an arithmetic number, because the mean of its divisors is an integer number (5430331368).

Almost surely, 2^21716097331 is an apocalyptic number.

21716097331 is a deficient number, since it is larger than the sum of its proper divisors (5228141).

21716097331 is an equidigital number, since it uses as much as digits as its factorization.

21716097331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5228140.

The product of its (nonzero) digits is 47628, while the sum is 40.

The spelling of 21716097331 in words is "twenty-one billion, seven hundred sixteen million, ninety-seven thousand, three hundred thirty-one".