21514162231 has 4 divisors (see below), whose sum is σ = 21516503112. Its totient is φ = 21511821352.

The previous prime is 21514162171. The next prime is 21514162247. The reversal of 21514162231 is 13226141512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21514162231 is a prime.

It is a super-2 number, since 2×21514162231² (a number of 21 digits) contains 22 as substring.

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 21514162231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21514162261) 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, 1156600 + ... + 1175053.

It is an arithmetic number, because the mean of its divisors is an integer number (5379125778).

Almost surely, 2^21514162231 is an apocalyptic number.

21514162231 is a deficient number, since it is larger than the sum of its proper divisors (2340881).

21514162231 is an equidigital number, since it uses as much as digits as its factorization.

21514162231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2340880.

The product of its digits is 2880, while the sum is 28.

The spelling of 21514162231 in words is "twenty-one billion, five hundred fourteen million, one hundred sixty-two thousand, two hundred thirty-one".