21877677812 has 6 divisors (see below), whose sum is σ = 38285936178. Its totient is φ = 10938838904.

The previous prime is 21877677761. The next prime is 21877677821.

21877677812 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 20573312356 + 1304365456 = 143434^2 + 36116^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2734709723 + ... + 2734709730.

It is an arithmetic number, because the mean of its divisors is an integer number (6380989363).

Almost surely, 2^21877677812 is an apocalyptic number.

It is an amenable number.

21877677812 is a deficient number, since it is larger than the sum of its proper divisors (16408258366).

21877677812 is a wasteful number, since it uses less digits than its factorization.

21877677812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5469419457 (or 5469419455 counting only the distinct ones).

The product of its digits is 3687936, while the sum is 56.

The spelling of 21877677812 in words is "twenty-one billion, eight hundred seventy-seven million, six hundred seventy-seven thousand, eight hundred twelve".