21700733131 has 32 divisors (see below), whose sum is σ = 28528128000. Its totient is φ = 15992290080.

The previous prime is 21700733107. The next prime is 21700733177. The reversal of 21700733131 is 13133700712.

It is a cyclic number.

It is not a de Polignac number, because 21700733131 - 2¹¹ = 21700731083 is a prime.

It is a super-2 number, since 2×21700733131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21700733131.

It is not an unprimeable number, because it can be changed into a prime (21700733191) 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 31 ways as a sum of consecutive naturals, for example, 863956 + ... + 888718.

It is an arithmetic number, because the mean of its divisors is an integer number (891504000).

Almost surely, 2^21700733131 is an apocalyptic number.

21700733131 is a deficient number, since it is larger than the sum of its proper divisors (6827394869).

21700733131 is a wasteful number, since it uses less digits than its factorization.

21700733131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25399.

The product of its (nonzero) digits is 2646, while the sum is 28.

The spelling of 21700733131 in words is "twenty-one billion, seven hundred million, seven hundred thirty-three thousand, one hundred thirty-one".