251094225507221 has 2 divisors, whose sum is σ = 251094225507222. Its totient is φ = 251094225507220.

The previous prime is 251094225507197. The next prime is 251094225507331. The reversal of 251094225507221 is 122705522490152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141785841352996 + 109308384154225 = 11907386^2 + 10455065^2 .

It is a cyclic number.

It is not a de Polignac number, because 251094225507221 - 2²² = 251094221312917 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251094225557221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125547112753610 + 125547112753611.

It is an arithmetic number, because the mean of its divisors is an integer number (125547112753611).

Almost surely, 2^{251094225507221} is an apocalyptic number.

It is an amenable number.

251094225507221 is a deficient number, since it is larger than the sum of its proper divisors (1).

251094225507221 is an equidigital number, since it uses as much as digits as its factorization.

251094225507221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008000, while the sum is 47.

Adding to 251094225507221 its reverse (122705522490152), we get a palindrome (373799747997373).

The spelling of 251094225507221 in words is "two hundred fifty-one trillion, ninety-four billion, two hundred twenty-five million, five hundred seven thousand, two hundred twenty-one".