22221491 has 2 divisors, whose sum is σ = 22221492. Its totient is φ = 22221490.

The previous prime is 22221487. The next prime is 22221517. The reversal of 22221491 is 19412222.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22221491 - 2² = 22221487 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22221461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110745 + 11110746.

It is an arithmetic number, because the mean of its divisors is an integer number (11110746).

Almost surely, 2^22221491 is an apocalyptic number.

22221491 is a deficient number, since it is larger than the sum of its proper divisors (1).

22221491 is an equidigital number, since it uses as much as digits as its factorization.

22221491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 23.

The square root of 22221491 is about 4713.9676494435. The cubic root of 22221491 is about 281.1411380499.

The spelling of 22221491 in words is "twenty-two million, two hundred twenty-one thousand, four hundred ninety-one".