21583473634 has 4 divisors (see below), whose sum is σ = 32375210454. Its totient is φ = 10791736816.

The previous prime is 21583473617. The next prime is 21583473641. The reversal of 21583473634 is 43637438512.

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., 12354989409 + 9228484225 = 111153^2 + 96065^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5395868407 + ... + 5395868410.

Almost surely, 2^21583473634 is an apocalyptic number.

21583473634 is a deficient number, since it is larger than the sum of its proper divisors (10791736820).

21583473634 is a wasteful number, since it uses less digits than its factorization.

21583473634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10791736819.

The product of its digits is 1451520, while the sum is 46.

The spelling of 21583473634 in words is "twenty-one billion, five hundred eighty-three million, four hundred seventy-three thousand, six hundred thirty-four".