21580160877 has 36 divisors (see below), whose sum is σ = 34298103840. Its totient is φ = 13065378480.

The previous prime is 21580160863. The next prime is 21580160897. The reversal of 21580160877 is 77806108512.

It is a happy number.

21580160877 is a `hidden beast` number, since 2 + 1 + 580 + 1 + 60 + 8 + 7 + 7 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-21580160877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21580160837) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1099968 + ... + 1119414.

Almost surely, 2^21580160877 is an apocalyptic number.

It is an amenable number.

21580160877 is a deficient number, since it is larger than the sum of its proper divisors (12717942963).

21580160877 is a wasteful number, since it uses less digits than its factorization.

21580160877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20494 (or 20480 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 45.

The spelling of 21580160877 in words is "twenty-one billion, five hundred eighty million, one hundred sixty thousand, eight hundred seventy-seven".