251421024144 has 40 divisors (see below), whose sum is σ = 649530962080. Its totient is φ = 83803569408.

The previous prime is 251421024131. The next prime is 251421024157. The reversal of 251421024144 is 441420124152.

It is an interprime number because it is at equal distance from previous prime (251421024131) and next prime (251421024157).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1251852 + ... + 1438740.

It is an arithmetic number, because the mean of its divisors is an integer number (16238274052).

Almost surely, 2^251421024144 is an apocalyptic number.

251421024144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

251421024144 is an abundant number, since it is smaller than the sum of its proper divisors (398109937936).

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

251421024144 is a wasteful number, since it uses less digits than its factorization.

251421024144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214927 (or 214921 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 30.

Adding to 251421024144 its reverse (441420124152), we get a palindrome (692841148296).

The spelling of 251421024144 in words is "two hundred fifty-one billion, four hundred twenty-one million, twenty-four thousand, one hundred forty-four".