251152433221 has 2 divisors, whose sum is σ = 251152433222. Its totient is φ = 251152433220.

The previous prime is 251152433219. The next prime is 251152433249. The reversal of 251152433221 is 122334251152.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143348560996 + 107803872225 = 378614^2 + 328335^2 .

It is a cyclic number.

It is not a de Polignac number, because 251152433221 - 2¹ = 251152433219 is a prime.

Together with 251152433219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251152433251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125576216610 + 125576216611.

It is an arithmetic number, because the mean of its divisors is an integer number (125576216611).

Almost surely, 2^251152433221 is an apocalyptic number.

It is an amenable number.

251152433221 is a deficient number, since it is larger than the sum of its proper divisors (1).

251152433221 is an equidigital number, since it uses as much as digits as its factorization.

251152433221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 31.

Adding to 251152433221 its reverse (122334251152), we get a palindrome (373486684373).

The spelling of 251152433221 in words is "two hundred fifty-one billion, one hundred fifty-two million, four hundred thirty-three thousand, two hundred twenty-one".