21477323724723 has 16 divisors (see below), whose sum is σ = 32558216845440. Its totient is φ = 13985234052552.

The previous prime is 21477323724653. The next prime is 21477323724793. The reversal of 21477323724723 is 32742732377412.

21477323724723 is a `hidden beast` number, since 2 + 1 + 4 + 77 + 32 + 3 + 72 + 472 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (21477323724653) and next prime (21477323724793).

It is a de Polignac number, because none of the positive numbers 2^k-21477323724723 is a prime.

It is a super-2 number, since 2×21477323724723² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21477323724723.

It is not an unprimeable number, because it can be changed into a prime (21477323724793) 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 15 ways as a sum of consecutive naturals, for example, 9249492261 + ... + 9249494582.

It is an arithmetic number, because the mean of its divisors is an integer number (2034888552840).

Almost surely, 2^{21477323724723} is an apocalyptic number.

21477323724723 is a deficient number, since it is larger than the sum of its proper divisors (11080893120717).

21477323724723 is a wasteful number, since it uses less digits than its factorization.

21477323724723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18498986895 (or 18498986889 counting only the distinct ones).

The product of its digits is 16595712, while the sum is 54.

The spelling of 21477323724723 in words is "twenty-one trillion, four hundred seventy-seven billion, three hundred twenty-three million, seven hundred twenty-four thousand, seven hundred twenty-three".