21777866074 has 4 divisors (see below), whose sum is σ = 32666799114. Its totient is φ = 10888933036.

The previous prime is 21777866069. The next prime is 21777866179. The reversal of 21777866074 is 47066877712.

21777866074 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20333334025 + 1444532049 = 142595^2 + 38007^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5444466517 + ... + 5444466520.

Almost surely, 2^21777866074 is an apocalyptic number.

21777866074 is a deficient number, since it is larger than the sum of its proper divisors (10888933040).

21777866074 is a wasteful number, since it uses less digits than its factorization.

21777866074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10888933039.

The product of its (nonzero) digits is 5531904, while the sum is 55.

The spelling of 21777866074 in words is "twenty-one billion, seven hundred seventy-seven million, eight hundred sixty-six thousand, seventy-four".