251243242422 has 8 divisors (see below), whose sum is σ = 502486484856. Its totient is φ = 83747747472.

The previous prime is 251243242409. The next prime is 251243242423. The reversal of 251243242422 is 224242342152.

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

251243242422 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251243242423) 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, 20936936863 + ... + 20936936874.

It is an arithmetic number, because the mean of its divisors is an integer number (62810810607).

Almost surely, 2^251243242422 is an apocalyptic number.

251243242422 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

251243242422 is a wasteful number, since it uses less digits than its factorization.

251243242422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41873873742.

The product of its digits is 61440, while the sum is 33.

Adding to 251243242422 its reverse (224242342152), we get a palindrome (475485584574).

The spelling of 251243242422 in words is "two hundred fifty-one billion, two hundred forty-three million, two hundred forty-two thousand, four hundred twenty-two".