21966872877 has 12 divisors (see below), whose sum is σ = 32112216864. Its totient is φ = 14468140680.

The previous prime is 21966872869. The next prime is 21966872903. The reversal of 21966872877 is 77827866912.

21966872877 is a `hidden beast` number, since 219 + 66 + 87 + 287 + 7 = 666.

It is not a de Polignac number, because 21966872877 - 2³ = 21966872869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21966872827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14702649 + ... + 14704142.

It is an arithmetic number, because the mean of its divisors is an integer number (2676018072).

Almost surely, 2^21966872877 is an apocalyptic number.

It is an amenable number.

21966872877 is a deficient number, since it is larger than the sum of its proper divisors (10145343987).

21966872877 is a wasteful number, since it uses less digits than its factorization.

21966872877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29406880 (or 29406877 counting only the distinct ones).

The product of its digits is 28449792, while the sum is 63.

The spelling of 21966872877 in words is "twenty-one billion, nine hundred sixty-six million, eight hundred seventy-two thousand, eight hundred seventy-seven".