251130400221 has 16 divisors (see below), whose sum is σ = 335639139264. Its totient is φ = 167021140224.

The previous prime is 251130400201. The next prime is 251130400223. The reversal of 251130400221 is 122004031152.

It is not a de Polignac number, because 251130400221 - 2⁵ = 251130400189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251130400223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6420901 + ... + 6459893.

It is an arithmetic number, because the mean of its divisors is an integer number (20977446204).

Almost surely, 2^251130400221 is an apocalyptic number.

It is an amenable number.

251130400221 is a deficient number, since it is larger than the sum of its proper divisors (84508739043).

251130400221 is a wasteful number, since it uses less digits than its factorization.

251130400221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44060.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 251130400221 its reverse (122004031152), we get a palindrome (373134431373).

The spelling of 251130400221 in words is "two hundred fifty-one billion, one hundred thirty million, four hundred thousand, two hundred twenty-one".