251300021225 has 12 divisors (see below), whose sum is σ = 339940392720. Its totient is φ = 182763651600.

The previous prime is 251300021221. The next prime is 251300021237. The reversal of 251300021225 is 522120003152.

It is not a de Polignac number, because 251300021225 - 2² = 251300021221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 251300021225.

It is not an unprimeable number, because it can be changed into a prime (251300021221) 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 in 11 ways as a sum of consecutive naturals, for example, 456908855 + ... + 456909404.

It is an arithmetic number, because the mean of its divisors is an integer number (28328366060).

Almost surely, 2^251300021225 is an apocalyptic number.

251300021225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

251300021225 is a deficient number, since it is larger than the sum of its proper divisors (88640371495).

251300021225 is a wasteful number, since it uses less digits than its factorization.

251300021225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913818280 (or 913818275 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 251300021225 its reverse (522120003152), we get a palindrome (773420024377).

The spelling of 251300021225 in words is "two hundred fifty-one billion, three hundred million, twenty-one thousand, two hundred twenty-five".