21002153079 has 8 divisors (see below), whose sum is σ = 28906189312. Its totient is φ = 13549776120.

The previous prime is 21002153069. The next prime is 21002153099. The reversal of 21002153079 is 97035120012.

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

It is not a de Polignac number, because 21002153079 - 2¹⁵ = 21002120311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002153069) 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, 112914709 + ... + 112914894.

It is an arithmetic number, because the mean of its divisors is an integer number (3613273664).

Almost surely, 2^21002153079 is an apocalyptic number.

21002153079 is a deficient number, since it is larger than the sum of its proper divisors (7904036233).

21002153079 is a wasteful number, since it uses less digits than its factorization.

21002153079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225829637.

The product of its (nonzero) digits is 3780, while the sum is 30.

The spelling of 21002153079 in words is "twenty-one billion, two million, one hundred fifty-three thousand, seventy-nine".