21377413881 has 24 divisors (see below), whose sum is σ = 30958150080. Its totient is φ = 14214898656.

The previous prime is 21377413873. The next prime is 21377413957. The reversal of 21377413881 is 18831477312.

It is not a de Polignac number, because 21377413881 - 2³ = 21377413873 is a prime.

It is a super-2 number, since 2×21377413881² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21377413801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7213306 + ... + 7216268.

It is an arithmetic number, because the mean of its divisors is an integer number (1289922920).

Almost surely, 2^21377413881 is an apocalyptic number.

It is an amenable number.

21377413881 is a deficient number, since it is larger than the sum of its proper divisors (9580736199).

21377413881 is a wasteful number, since it uses less digits than its factorization.

21377413881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4765 (or 4762 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The spelling of 21377413881 in words is "twenty-one billion, three hundred seventy-seven million, four hundred thirteen thousand, eight hundred eighty-one".