21471537134436 has 24 divisors (see below), whose sum is σ = 50162029234464. Its totient is φ = 7148353913280.

The previous prime is 21471537134417. The next prime is 21471537134441. The reversal of 21471537134436 is 63443173517412.

It is a super-2 number, since 2×21471537134436² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1103131305 + ... + 1103150768.

It is an arithmetic number, because the mean of its divisors is an integer number (2090084551436).

Almost surely, 2^{21471537134436} is an apocalyptic number.

It is an amenable number.

21471537134436 is an abundant number, since it is smaller than the sum of its proper divisors (28690492100028).

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

21471537134436 is a wasteful number, since it uses less digits than its factorization.

21471537134436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2206282891 (or 2206282889 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 51.

The spelling of 21471537134436 in words is "twenty-one trillion, four hundred seventy-one billion, five hundred thirty-seven million, one hundred thirty-four thousand, four hundred thirty-six".