21956767666634 has 4 divisors (see below), whose sum is σ = 32935151499954. Its totient is φ = 10978383833316.

The previous prime is 21956767666619. The next prime is 21956767666679. The reversal of 21956767666634 is 43666676765912.

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., 14173365151009 + 7783402515625 = 3764753^2 + 2789875^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5489191916657 + ... + 5489191916660.

Almost surely, 2^{21956767666634} is an apocalyptic number.

21956767666634 is a deficient number, since it is larger than the sum of its proper divisors (10978383833320).

21956767666634 is a wasteful number, since it uses less digits than its factorization.

21956767666634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10978383833319.

The product of its digits is 2469035520, while the sum is 74.

The spelling of 21956767666634 in words is "twenty-one trillion, nine hundred fifty-six billion, seven hundred sixty-seven million, six hundred sixty-six thousand, six hundred thirty-four".