25221337 has 2 divisors, whose sum is σ = 25221338. Its totient is φ = 25221336.

The previous prime is 25221323. The next prime is 25221347. The reversal of 25221337 is 73312252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25190361 + 30976 = 5019^2 + 176^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25221337 is a prime.

It is a super-2 number, since 2×25221337² = 1272231680135138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25221307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12610668 + 12610669.

It is an arithmetic number, because the mean of its divisors is an integer number (12610669).

Almost surely, 2^25221337 is an apocalyptic number.

It is an amenable number.

25221337 is a deficient number, since it is larger than the sum of its proper divisors (1).

25221337 is an equidigital number, since it uses as much as digits as its factorization.

25221337 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 25.

The square root of 25221337 is about 5022.0849256061. The cubic root of 25221337 is about 293.2621640645.

Adding to 25221337 its reverse (73312252), we get a palindrome (98533589).

The spelling of 25221337 in words is "twenty-five million, two hundred twenty-one thousand, three hundred thirty-seven".