21322723513 has 16 divisors (see below), whose sum is σ = 26853667456. Its totient is φ = 16478380800.

The previous prime is 21322723463. The next prime is 21322723549. The reversal of 21322723513 is 31532722312.

It is not a de Polignac number, because 21322723513 - 2²¹ = 21320626361 is a prime.

It is a super-2 number, since 2×21322723513² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21322723573) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2720688 + ... + 2728513.

It is an arithmetic number, because the mean of its divisors is an integer number (1678354216).

Almost surely, 2^21322723513 is an apocalyptic number.

It is an amenable number.

21322723513 is a deficient number, since it is larger than the sum of its proper divisors (5530943943).

21322723513 is a wasteful number, since it uses less digits than its factorization.

21322723513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5449264.

The product of its digits is 15120, while the sum is 31.

The spelling of 21322723513 in words is "twenty-one billion, three hundred twenty-two million, seven hundred twenty-three thousand, five hundred thirteen".