251340221125 has 32 divisors (see below), whose sum is σ = 358927096320. Its totient is φ = 172134057600.

The previous prime is 251340221101. The next prime is 251340221137. The reversal of 251340221125 is 521122043152.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-251340221125 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 251340221093 and 251340221102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 530344 + ... + 885406.

It is an arithmetic number, because the mean of its divisors is an integer number (11216471760).

Almost surely, 2^251340221125 is an apocalyptic number.

251340221125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

251340221125 is a deficient number, since it is larger than the sum of its proper divisors (107586875195).

251340221125 is an equidigital number, since it uses as much as digits as its factorization.

251340221125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355894 (or 355884 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 251340221125 its reverse (521122043152), we get a palindrome (772462264277).

The spelling of 251340221125 in words is "two hundred fifty-one billion, three hundred forty million, two hundred twenty-one thousand, one hundred twenty-five".