23440420191 has 16 divisors (see below), whose sum is σ = 31359710304. Its totient is φ = 15574078464.

The previous prime is 23440420177. The next prime is 23440420207. The reversal of 23440420191 is 19102404432.

It is not a de Polignac number, because 23440420191 - 2¹¹ = 23440418143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23440420111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4442731 + ... + 4448003.

It is an arithmetic number, because the mean of its divisors is an integer number (1959981894).

Almost surely, 2^23440420191 is an apocalyptic number.

23440420191 is a deficient number, since it is larger than the sum of its proper divisors (7919290113).

23440420191 is a wasteful number, since it uses less digits than its factorization.

23440420191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10010.

The product of its (nonzero) digits is 6912, while the sum is 30.

The spelling of 23440420191 in words is "twenty-three billion, four hundred forty million, four hundred twenty thousand, one hundred ninety-one".