21507675674 has 4 divisors (see below), whose sum is σ = 32261513514. Its totient is φ = 10753837836.

The previous prime is 21507675671. The next prime is 21507675713. The reversal of 21507675674 is 47657670512.

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., 19593000625 + 1914675049 = 139975^2 + 43757^2 .

It is a super-2 number, since 2×21507675674² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21507675671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5376918917 + ... + 5376918920.

Almost surely, 2^21507675674 is an apocalyptic number.

21507675674 is a deficient number, since it is larger than the sum of its proper divisors (10753837840).

21507675674 is a wasteful number, since it uses less digits than its factorization.

21507675674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10753837839.

The product of its (nonzero) digits is 2469600, while the sum is 50.

The spelling of 21507675674 in words is "twenty-one billion, five hundred seven million, six hundred seventy-five thousand, six hundred seventy-four".