22491338437 has 4 divisors (see below), whose sum is σ = 22495886176. Its totient is φ = 22486790700.

The previous prime is 22491338393. The next prime is 22491338447. The reversal of 22491338437 is 73483319422.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22491338437 - 2¹¹ = 22491336389 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 (22491338447) 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, 2266443 + ... + 2276344.

It is an arithmetic number, because the mean of its divisors is an integer number (5623971544).

Almost surely, 2^22491338437 is an apocalyptic number.

It is an amenable number.

22491338437 is a deficient number, since it is larger than the sum of its proper divisors (4547739).

22491338437 is an equidigital number, since it uses as much as digits as its factorization.

22491338437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4547738.

The product of its digits is 870912, while the sum is 46.

The spelling of 22491338437 in words is "twenty-two billion, four hundred ninety-one million, three hundred thirty-eight thousand, four hundred thirty-seven".