21703274731 has 4 divisors (see below), whose sum is σ = 21710692512. Its totient is φ = 21695856952.

The previous prime is 21703274687. The next prime is 21703274737. The reversal of 21703274731 is 13747230712.

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 21703274731 - 2¹³ = 21703266539 is a prime.

It is a super-2 number, since 2×21703274731² (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 (21703274737) 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 3 ways as a sum of consecutive naturals, for example, 3704500 + ... + 3710353.

It is an arithmetic number, because the mean of its divisors is an integer number (5427673128).

Almost surely, 2^21703274731 is an apocalyptic number.

21703274731 is a deficient number, since it is larger than the sum of its proper divisors (7417781).

21703274731 is an equidigital number, since it uses as much as digits as its factorization.

21703274731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7417780.

The product of its (nonzero) digits is 49392, while the sum is 37.

The spelling of 21703274731 in words is "twenty-one billion, seven hundred three million, two hundred seventy-four thousand, seven hundred thirty-one".