21766070474 has 4 divisors (see below), whose sum is σ = 32649105714. Its totient is φ = 10883035236.

The previous prime is 21766070467. The next prime is 21766070507. The reversal of 21766070474 is 47407066712.

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., 18589959025 + 3176111449 = 136345^2 + 56357^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5441517617 + ... + 5441517620.

Almost surely, 2^21766070474 is an apocalyptic number.

21766070474 is a deficient number, since it is larger than the sum of its proper divisors (10883035240).

21766070474 is a wasteful number, since it uses less digits than its factorization.

21766070474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10883035239.

The product of its (nonzero) digits is 395136, while the sum is 44.

The spelling of 21766070474 in words is "twenty-one billion, seven hundred sixty-six million, seventy thousand, four hundred seventy-four".