21317807474 has 4 divisors (see below), whose sum is σ = 31976711214. Its totient is φ = 10658903736.

The previous prime is 21317807453. The next prime is 21317807491. The reversal of 21317807474 is 47470871312.

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., 11835916849 + 9481890625 = 108793^2 + 97375^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5329451867 + ... + 5329451870.

Almost surely, 2^21317807474 is an apocalyptic number.

21317807474 is a deficient number, since it is larger than the sum of its proper divisors (10658903740).

21317807474 is a wasteful number, since it uses less digits than its factorization.

21317807474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10658903739.

The product of its (nonzero) digits is 263424, while the sum is 44.

The spelling of 21317807474 in words is "twenty-one billion, three hundred seventeen million, eight hundred seven thousand, four hundred seventy-four".