21039079730 has 16 divisors (see below), whose sum is σ = 38238018624. Its totient is φ = 8333926320.

The previous prime is 21039079697. The next prime is 21039079739. The reversal of 21039079730 is 3797093012.

It is not an unprimeable number, because it can be changed into a prime (21039079739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10212116 + ... + 10214175.

It is an arithmetic number, because the mean of its divisors is an integer number (2389876164).

Almost surely, 2^21039079730 is an apocalyptic number.

21039079730 is a deficient number, since it is larger than the sum of its proper divisors (17198938894).

21039079730 is a wasteful number, since it uses less digits than its factorization.

21039079730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20426401.

The product of its (nonzero) digits is 71442, while the sum is 41.

The spelling of 21039079730 in words is "twenty-one billion, thirty-nine million, seventy-nine thousand, seven hundred thirty".