250121131220 has 12 divisors (see below), whose sum is σ = 525254375604. Its totient is φ = 100048452480.

The previous prime is 250121131219. The next prime is 250121131297. The reversal of 250121131220 is 22131121052.

It can be written as a sum of positive squares in 2 ways, for example, as 88764668356 + 161356462864 = 297934^2 + 401692^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 12506056561 = 250121131220 / (2 + 5 + 0 + 1 + 2 + 1 + 1 + 3 + 1 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 250121131192 and 250121131201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6253028261 + ... + 6253028300.

It is an arithmetic number, because the mean of its divisors is an integer number (43771197967).

Almost surely, 2^250121131220 is an apocalyptic number.

250121131220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

250121131220 is an abundant number, since it is smaller than the sum of its proper divisors (275133244384).

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

250121131220 is a wasteful number, since it uses less digits than its factorization.

250121131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12506056570 (or 12506056568 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 250121131220 its reverse (22131121052), we get a palindrome (272252252272).

The spelling of 250121131220 in words is "two hundred fifty billion, one hundred twenty-one million, one hundred thirty-one thousand, two hundred twenty".