21731457151 has 4 divisors (see below), whose sum is σ = 21788197632. Its totient is φ = 21674716672.

The previous prime is 21731457127. The next prime is 21731457173. The reversal of 21731457151 is 15175413712.

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 21731457151 - 2⁹ = 21731456639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21731457151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21731457191) 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, 28369666 + ... + 28370431.

It is an arithmetic number, because the mean of its divisors is an integer number (5447049408).

Almost surely, 2^21731457151 is an apocalyptic number.

21731457151 is a deficient number, since it is larger than the sum of its proper divisors (56740481).

21731457151 is an equidigital number, since it uses as much as digits as its factorization.

21731457151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56740480.

The product of its digits is 29400, while the sum is 37.

The spelling of 21731457151 in words is "twenty-one billion, seven hundred thirty-one million, four hundred fifty-seven thousand, one hundred fifty-one".