23921049599 has 4 divisors (see below), whose sum is σ = 24059321736. Its totient is φ = 23782777464.

The previous prime is 23921049587. The next prime is 23921049637. The reversal of 23921049599 is 99594012932.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23921049599 is a prime.

It is a super-2 number, since 2×23921049599² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23921049599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23921049569) 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, 69135809 + ... + 69136154.

It is an arithmetic number, because the mean of its divisors is an integer number (6014830434).

Almost surely, 2^23921049599 is an apocalyptic number.

23921049599 is a deficient number, since it is larger than the sum of its proper divisors (138272137).

23921049599 is a wasteful number, since it uses less digits than its factorization.

23921049599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138272136.

The product of its (nonzero) digits is 1574640, while the sum is 53.

The spelling of 23921049599 in words is "twenty-three billion, nine hundred twenty-one million, forty-nine thousand, five hundred ninety-nine".