21479311184724 has 144 divisors (see below), whose sum is σ = 57467748409344. Its totient is φ = 6750348897600.

The previous prime is 21479311184713. The next prime is 21479311184743. The reversal of 21479311184724 is 42748111397412.

21479311184724 is a `hidden beast` number, since 2 + 1 + 479 + 31 + 118 + 4 + 7 + 24 = 666.

It is a super-2 number, since 2×21479311184724² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 249394429 + ... + 249480539.

It is an arithmetic number, because the mean of its divisors is an integer number (399081586176).

Almost surely, 2^{21479311184724} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21479311184724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28733874204672).

21479311184724 is an abundant number, since it is smaller than the sum of its proper divisors (35988437224620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21479311184724 is a wasteful number, since it uses less digits than its factorization.

21479311184724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90458 (or 90453 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The spelling of 21479311184724 in words is "twenty-one trillion, four hundred seventy-nine billion, three hundred eleven million, one hundred eighty-four thousand, seven hundred twenty-four".