21677356877 has 4 divisors (see below), whose sum is σ = 23648025696. Its totient is φ = 19706688060.

The previous prime is 21677356867. The next prime is 21677356889. The reversal of 21677356877 is 77865377612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21677356877 - 2³⁴ = 4497487693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21677356847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 985334393 + ... + 985334414.

It is an arithmetic number, because the mean of its divisors is an integer number (5912006424).

Almost surely, 2^21677356877 is an apocalyptic number.

It is an amenable number.

21677356877 is a deficient number, since it is larger than the sum of its proper divisors (1970668819).

21677356877 is a wasteful number, since it uses less digits than its factorization.

21677356877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1970668818.

The product of its digits is 20744640, while the sum is 59.

The spelling of 21677356877 in words is "twenty-one billion, six hundred seventy-seven million, three hundred fifty-six thousand, eight hundred seventy-seven".