251005420424 has 64 divisors (see below), whose sum is σ = 515563850880. Its totient is φ = 113617728000.

The previous prime is 251005420339. The next prime is 251005420469. The reversal of 251005420424 is 424024500152.

It is an unprimeable number.

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, 33193604 + ... + 33201164.

It is an arithmetic number, because the mean of its divisors is an integer number (8055685170).

Almost surely, 2^251005420424 is an apocalyptic number.

It is an amenable number.

251005420424 is an abundant number, since it is smaller than the sum of its proper divisors (264558430456).

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

251005420424 is a wasteful number, since it uses less digits than its factorization.

251005420424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9102 (or 9098 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 29.

Adding to 251005420424 its reverse (424024500152), we get a palindrome (675029920576).

The spelling of 251005420424 in words is "two hundred fifty-one billion, five million, four hundred twenty thousand, four hundred twenty-four".