21872350079 has 4 divisors (see below), whose sum is σ = 21877690200. Its totient is φ = 21867009960.

The previous prime is 21872350063. The next prime is 21872350117. The reversal of 21872350079 is 97005327812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21872350079 - 2⁴ = 21872350063 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 (21872352079) 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, 2663912 + ... + 2672109.

It is an arithmetic number, because the mean of its divisors is an integer number (5469422550).

Almost surely, 2^21872350079 is an apocalyptic number.

21872350079 is a deficient number, since it is larger than the sum of its proper divisors (5340121).

21872350079 is an equidigital number, since it uses as much as digits as its factorization.

21872350079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5340120.

The product of its (nonzero) digits is 211680, while the sum is 44.

The spelling of 21872350079 in words is "twenty-one billion, eight hundred seventy-two million, three hundred fifty thousand, seventy-nine".