12521137 has 2 divisors, whose sum is σ = 12521138. Its totient is φ = 12521136.

The previous prime is 12521107. The next prime is 12521141. The reversal of 12521137 is 73112521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7096896 + 5424241 = 2664^2 + 2329^2 .

It is a cyclic number.

It is not a de Polignac number, because 12521137 - 2⁷ = 12521009 is a prime.

It is not a weakly prime, because it can be changed into another prime (12521107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6260568 + 6260569.

It is an arithmetic number, because the mean of its divisors is an integer number (6260569).

Almost surely, 2^12521137 is an apocalyptic number.

It is an amenable number.

12521137 is a deficient number, since it is larger than the sum of its proper divisors (1).

12521137 is an equidigital number, since it uses as much as digits as its factorization.

12521137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420, while the sum is 22.

The square root of 12521137 is about 3538.5218665426. The cubic root of 12521137 is about 232.2101803679.

Adding to 12521137 its reverse (73112521), we get a palindrome (85633658).

The spelling of 12521137 in words is "twelve million, five hundred twenty-one thousand, one hundred thirty-seven".