21554365131 has 48 divisors (see below), whose sum is σ = 34701838080. Its totient is φ = 12802510080.

The previous prime is 21554365103. The next prime is 21554365139. The reversal of 21554365131 is 13156345512.

21554365131 is a `hidden beast` number, since 21 + 5 + 543 + 65 + 1 + 31 = 666.

It is not a de Polignac number, because 21554365131 - 2⁵ = 21554365099 is a prime.

It is a super-2 number, since 2×21554365131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21554365139) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1403265 + ... + 1418541.

It is an arithmetic number, because the mean of its divisors is an integer number (722954960).

Almost surely, 2^21554365131 is an apocalyptic number.

21554365131 is a deficient number, since it is larger than the sum of its proper divisors (13147472949).

21554365131 is a wasteful number, since it uses less digits than its factorization.

21554365131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15716 (or 15713 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The spelling of 21554365131 in words is "twenty-one billion, five hundred fifty-four million, three hundred sixty-five thousand, one hundred thirty-one".