21479837523 has 8 divisors (see below), whose sum is σ = 28640833536. Its totient is φ = 14319366600.

The previous prime is 21479837453. The next prime is 21479837531. The reversal of 21479837523 is 32573897412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21479837523 - 2¹⁶ = 21479771987 is a prime.

It is a super-2 number, since 2×21479837523² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21479837593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23083 + ... + 208548.

It is an arithmetic number, because the mean of its divisors is an integer number (3580104192).

Almost surely, 2^21479837523 is an apocalyptic number.

21479837523 is a deficient number, since it is larger than the sum of its proper divisors (7160996013).

21479837523 is a wasteful number, since it uses less digits than its factorization.

21479837523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262545.

The product of its digits is 2540160, while the sum is 51.

The spelling of 21479837523 in words is "twenty-one billion, four hundred seventy-nine million, eight hundred thirty-seven thousand, five hundred twenty-three".