251250521412 has 96 divisors (see below), whose sum is σ = 682039733760. Its totient is φ = 71142289920.

The previous prime is 251250521393. The next prime is 251250521419. The reversal of 251250521412 is 214125052152.

It is a self number, because there is not a number n which added to its sum of digits gives 251250521412.

It is not an unprimeable number, because it can be changed into a prime (251250521419) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90838 + ... + 714669.

It is an arithmetic number, because the mean of its divisors is an integer number (7104580560).

Almost surely, 2^251250521412 is an apocalyptic number.

251250521412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251250521412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (341019866880).

251250521412 is an abundant number, since it is smaller than the sum of its proper divisors (430789212348).

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

251250521412 is a wasteful number, since it uses less digits than its factorization.

251250521412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805681 (or 805679 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

Adding to 251250521412 its reverse (214125052152), we get a palindrome (465375573564).

The spelling of 251250521412 in words is "two hundred fifty-one billion, two hundred fifty million, five hundred twenty-one thousand, four hundred twelve".