21872865023 has 8 divisors (see below), whose sum is σ = 23175535392. Its totient is φ = 20571975936.

The previous prime is 21872865019. The next prime is 21872865031. The reversal of 21872865023 is 32056827812.

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

It is a cyclic number.

It is not a de Polignac number, because 21872865023 - 2² = 21872865019 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 (21872865073) 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, 419990 + ... + 469187.

It is an arithmetic number, because the mean of its divisors is an integer number (2896941924).

Almost surely, 2^21872865023 is an apocalyptic number.

21872865023 is a deficient number, since it is larger than the sum of its proper divisors (1302670369).

21872865023 is a wasteful number, since it uses less digits than its factorization.

21872865023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890641.

The product of its (nonzero) digits is 322560, while the sum is 44.

The spelling of 21872865023 in words is "twenty-one billion, eight hundred seventy-two million, eight hundred sixty-five thousand, twenty-three".