1251341231220 has 144 divisors (see below), whose sum is σ = 3802910791680. Its totient is φ = 333060807168.

The previous prime is 1251341231207. The next prime is 1251341231221. The reversal of 1251341231220 is 221321431521.

It is a happy number.

1251341231220 is a `hidden beast` number, since 1 + 2 + 5 + 1 + 341 + 2 + 312 + 2 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251341231221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 345386329 + ... + 345389951.

It is an arithmetic number, because the mean of its divisors is an integer number (26409102720).

Almost surely, 2^{1251341231220} is an apocalyptic number.

1251341231220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251341231220 is an abundant number, since it is smaller than the sum of its proper divisors (2551569560460).

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

1251341231220 is a wasteful number, since it uses less digits than its factorization.

1251341231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6734 (or 6729 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

Adding to 1251341231220 its reverse (221321431521), we get a palindrome (1472662662741).

The spelling of 1251341231220 in words is "one trillion, two hundred fifty-one billion, three hundred forty-one million, two hundred thirty-one thousand, two hundred twenty".