22391444381 has 2 divisors, whose sum is σ = 22391444382. Its totient is φ = 22391444380.

The previous prime is 22391444353. The next prime is 22391444389. The reversal of 22391444381 is 18344419322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15652512100 + 6738932281 = 125110^2 + 82091^2 .

It is a cyclic number.

It is not a de Polignac number, because 22391444381 - 2¹⁰ = 22391443357 is a prime.

It is a super-2 number, since 2×22391444381² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22391444389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11195722190 + 11195722191.

It is an arithmetic number, because the mean of its divisors is an integer number (11195722191).

Almost surely, 2^22391444381 is an apocalyptic number.

It is an amenable number.

22391444381 is a deficient number, since it is larger than the sum of its proper divisors (1).

22391444381 is an equidigital number, since it uses as much as digits as its factorization.

22391444381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 41.

The spelling of 22391444381 in words is "twenty-two billion, three hundred ninety-one million, four hundred forty-four thousand, three hundred eighty-one".