21307730474 has 8 divisors (see below), whose sum is σ = 31962488868. Its totient is φ = 10653567520.

The previous prime is 21307730473. The next prime is 21307730501. The reversal of 21307730474 is 47403770312.

It can be written as a sum of positive squares in 2 ways, for example, as 20983550449 + 324180025 = 144857^2 + 18005^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21307730473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44867 + ... + 211254.

Almost surely, 2^21307730474 is an apocalyptic number.

21307730474 is a deficient number, since it is larger than the sum of its proper divisors (10654758394).

21307730474 is a wasteful number, since it uses less digits than its factorization.

21307730474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297720.

The product of its (nonzero) digits is 98784, while the sum is 38.

The spelling of 21307730474 in words is "twenty-one billion, three hundred seven million, seven hundred thirty thousand, four hundred seventy-four".