251226210140 has 48 divisors (see below), whose sum is σ = 540506633184. Its totient is φ = 98027904000.

The previous prime is 251226210097. The next prime is 251226210163. The reversal of 251226210140 is 41012622152.

It is a super-2 number, since 2×251226210140² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11018432 + ... + 11041208.

It is an arithmetic number, because the mean of its divisors is an integer number (11260554858).

Almost surely, 2^251226210140 is an apocalyptic number.

251226210140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251226210140 is an abundant number, since it is smaller than the sum of its proper divisors (289280423044).

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

251226210140 is a wasteful number, since it uses less digits than its factorization.

251226210140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36278 (or 36276 counting only the distinct ones).

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

Adding to 251226210140 its reverse (41012622152), we get a palindrome (292238832292).

The spelling of 251226210140 in words is "two hundred fifty-one billion, two hundred twenty-six million, two hundred ten thousand, one hundred forty".