21880385399 has 4 divisors (see below), whose sum is σ = 21984084120. Its totient is φ = 21776686680.

The previous prime is 21880385339. The next prime is 21880385413. The reversal of 21880385399 is 99358308812.

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 21880385399 - 2²⁸ = 21611949943 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 (21880385309) 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, 51849044 + ... + 51849465.

It is an arithmetic number, because the mean of its divisors is an integer number (5496021030).

Almost surely, 2^21880385399 is an apocalyptic number.

21880385399 is a deficient number, since it is larger than the sum of its proper divisors (103698721).

21880385399 is a wasteful number, since it uses less digits than its factorization.

21880385399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103698720.

The product of its (nonzero) digits is 3732480, while the sum is 56.

The spelling of 21880385399 in words is "twenty-one billion, eight hundred eighty million, three hundred eighty-five thousand, three hundred ninety-nine".