21577366131 has 8 divisors (see below), whose sum is σ = 30284022720. Its totient is φ = 13627810152.

The previous prime is 21577366079. The next prime is 21577366141. The reversal of 21577366131 is 13166377512.

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

It is not a de Polignac number, because 21577366131 - 2⁹ = 21577365619 is a prime.

It is a super-2 number, since 2×21577366131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21577366141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189275085 + ... + 189275198.

It is an arithmetic number, because the mean of its divisors is an integer number (3785502840).

Almost surely, 2^21577366131 is an apocalyptic number.

21577366131 is a deficient number, since it is larger than the sum of its proper divisors (8706656589).

21577366131 is a wasteful number, since it uses less digits than its factorization.

21577366131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378550305.

The product of its digits is 158760, while the sum is 42.

The spelling of 21577366131 in words is "twenty-one billion, five hundred seventy-seven million, three hundred sixty-six thousand, one hundred thirty-one".