251041221132 has 48 divisors (see below), whose sum is σ = 630873008640. Its totient is φ = 77237149248.

The previous prime is 251041221107. The next prime is 251041221139. The reversal of 251041221132 is 231122140152.

It is a happy number.

It is a super-2 number, since 2×251041221132² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (251041221139) 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 15 ways as a sum of consecutive naturals, for example, 2075103 + ... + 2192745.

It is an arithmetic number, because the mean of its divisors is an integer number (13143187680).

Almost surely, 2^251041221132 is an apocalyptic number.

It is an amenable number.

251041221132 is an abundant number, since it is smaller than the sum of its proper divisors (379831787508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251041221132 is a wasteful number, since it uses less digits than its factorization.

251041221132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131342 (or 131340 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 251041221132 its reverse (231122140152), we get a palindrome (482163361284).

The spelling of 251041221132 in words is "two hundred fifty-one billion, forty-one million, two hundred twenty-one thousand, one hundred thirty-two".