21974567513 has 4 divisors (see below), whose sum is σ = 22097330640. Its totient is φ = 21851804388.

The previous prime is 21974567507. The next prime is 21974567551. The reversal of 21974567513 is 31576547912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21974567513 - 2⁶ = 21974567449 is a prime.

It is a super-3 number, since 3×21974567513³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21974567413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61381295 + ... + 61381652.

It is an arithmetic number, because the mean of its divisors is an integer number (5524332660).

Almost surely, 2^21974567513 is an apocalyptic number.

It is an amenable number.

21974567513 is a deficient number, since it is larger than the sum of its proper divisors (122763127).

21974567513 is a wasteful number, since it uses less digits than its factorization.

21974567513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122763126.

The product of its digits is 1587600, while the sum is 50.

The spelling of 21974567513 in words is "twenty-one billion, nine hundred seventy-four million, five hundred sixty-seven thousand, five hundred thirteen".