21302730312 has 16 divisors (see below), whose sum is σ = 53256825840. Its totient is φ = 7100910096.

The previous prime is 21302730299. The next prime is 21302730437. The reversal of 21302730312 is 21303720312.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 887613763 = 21302730312 / (2 + 1 + 3 + 0 + 2 + 7 + 3 + 0 + 3 + 1 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 443806858 + ... + 443806905.

It is an arithmetic number, because the mean of its divisors is an integer number (3328551615).

Almost surely, 2^21302730312 is an apocalyptic number.

It is an amenable number.

21302730312 is an abundant number, since it is smaller than the sum of its proper divisors (31954095528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21302730312 is a wasteful number, since it uses less digits than its factorization.

21302730312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887613772 (or 887613768 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 24.

The spelling of 21302730312 in words is "twenty-one billion, three hundred two million, seven hundred thirty thousand, three hundred twelve".