22421513 has 2 divisors, whose sum is σ = 22421514. Its totient is φ = 22421512.

The previous prime is 22421479. The next prime is 22421551. The reversal of 22421513 is 31512422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19642624 + 2778889 = 4432^2 + 1667^2 .

It is a cyclic number.

It is not a de Polignac number, because 22421513 - 2⁶ = 22421449 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (22421813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11210756 + 11210757.

It is an arithmetic number, because the mean of its divisors is an integer number (11210757).

Almost surely, 2^22421513 is an apocalyptic number.

It is an amenable number.

22421513 is a deficient number, since it is larger than the sum of its proper divisors (1).

22421513 is an equidigital number, since it uses as much as digits as its factorization.

22421513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 20.

The square root of 22421513 is about 4735.1360064944. The cubic root of 22421513 is about 281.9821635853.

Adding to 22421513 its reverse (31512422), we get a palindrome (53933935).

Subtracting 22421513 from its reverse (31512422), we obtain a palindrome (9090909).

The spelling of 22421513 in words is "twenty-two million, four hundred twenty-one thousand, five hundred thirteen".