25221137 has 2 divisors, whose sum is σ = 25221138. Its totient is φ = 25221136.

The previous prime is 25221103. The next prime is 25221173. The reversal of 25221137 is 73112252.

It is a happy number.

Together with next prime (25221173) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24960016 + 261121 = 4996^2 + 511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25221137 is a prime.

It is a super-2 number, since 2×25221137² = 1272211503145538, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25221337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12610568 + 12610569.

It is an arithmetic number, because the mean of its divisors is an integer number (12610569).

Almost surely, 2^25221137 is an apocalyptic number.

It is an amenable number.

25221137 is a deficient number, since it is larger than the sum of its proper divisors (1).

25221137 is an equidigital number, since it uses as much as digits as its factorization.

25221137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 23.

The square root of 25221137 is about 5022.0650135178. The cubic root of 25221137 is about 293.2613888929.

Adding to 25221137 its reverse (73112252), we get a palindrome (98333389).

The spelling of 25221137 in words is "twenty-five million, two hundred twenty-one thousand, one hundred thirty-seven".