23210319991 has 4 divisors (see below), whose sum is σ = 24431915800. Its totient is φ = 21988724184.

The previous prime is 23210319901. The next prime is 23210320009. The reversal of 23210319991 is 19991301232.

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 23210319991 - 2⁹ = 23210319479 is a prime.

It is a super-2 number, since 2×23210319991² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23210319901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 610797876 + ... + 610797913.

It is an arithmetic number, because the mean of its divisors is an integer number (6107978950).

Almost surely, 2^23210319991 is an apocalyptic number.

23210319991 is a deficient number, since it is larger than the sum of its proper divisors (1221595809).

23210319991 is a wasteful number, since it uses less digits than its factorization.

23210319991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221595808.

The product of its (nonzero) digits is 26244, while the sum is 40.

The spelling of 23210319991 in words is "twenty-three billion, two hundred ten million, three hundred nineteen thousand, nine hundred ninety-one".