23409991821 has 8 divisors (see below), whose sum is σ = 31679193184. Its totient is φ = 15373725840.

The previous prime is 23409991817. The next prime is 23409991841. The reversal of 23409991821 is 12819990432.

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

It is not a de Polignac number, because 23409991821 - 2² = 23409991817 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 (23409991841) 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, 58233610 + ... + 58234011.

It is an arithmetic number, because the mean of its divisors is an integer number (3959899148).

Almost surely, 2^23409991821 is an apocalyptic number.

It is an amenable number.

23409991821 is a deficient number, since it is larger than the sum of its proper divisors (8269201363).

23409991821 is a wasteful number, since it uses less digits than its factorization.

23409991821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116467691.

The product of its (nonzero) digits is 279936, while the sum is 48.

The spelling of 23409991821 in words is "twenty-three billion, four hundred nine million, nine hundred ninety-one thousand, eight hundred twenty-one".