251121132242 has 8 divisors (see below), whose sum is σ = 376792269696. Its totient is φ = 125523709012.

The previous prime is 251121132239. The next prime is 251121132247. The reversal of 251121132242 is 242231121152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (251121132247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18420038 + ... + 18433665.

It is an arithmetic number, because the mean of its divisors is an integer number (47099033712).

Almost surely, 2^251121132242 is an apocalyptic number.

251121132242 is a deficient number, since it is larger than the sum of its proper divisors (125671137454).

251121132242 is a wasteful number, since it uses less digits than its factorization.

251121132242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36857112.

The product of its digits is 1920, while the sum is 26.

Adding to 251121132242 its reverse (242231121152), we get a palindrome (493352253394).

The spelling of 251121132242 in words is "two hundred fifty-one billion, one hundred twenty-one million, one hundred thirty-two thousand, two hundred forty-two".