22254721 has 2 divisors, whose sum is σ = 22254722. Its totient is φ = 22254720.

The previous prime is 22254703. The next prime is 22254733. The reversal of 22254721 is 12745222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20657025 + 1597696 = 4545^2 + 1264^2 .

It is a cyclic number.

It is not a de Polignac number, because 22254721 - 2¹⁷ = 22123649 is a prime.

It is not a weakly prime, because it can be changed into another prime (22254761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11127360 + 11127361.

It is an arithmetic number, because the mean of its divisors is an integer number (11127361).

Almost surely, 2^22254721 is an apocalyptic number.

It is an amenable number.

22254721 is a deficient number, since it is larger than the sum of its proper divisors (1).

22254721 is an equidigital number, since it uses as much as digits as its factorization.

22254721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 25.

The square root of 22254721 is about 4717.4909644853. The cubic root of 22254721 is about 281.2812076646.

Adding to 22254721 its reverse (12745222), we get a palindrome (34999943).

The spelling of 22254721 in words is "twenty-two million, two hundred fifty-four thousand, seven hundred twenty-one".