1251204424000 has 112 divisors (see below), whose sum is σ = 3104565521616. Its totient is φ = 499519488000.

The previous prime is 1251204423977. The next prime is 1251204424003. The reversal of 1251204424000 is 4244021521.

It can be written as a sum of positive squares in 8 ways, for example, as 869310087424 + 381894336576 = 932368^2 + 617976^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251204424003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4017904 + ... + 4318096.

Almost surely, 2^{1251204424000} is an apocalyptic number.

1251204424000 is a gapful number since it is divisible by the number (10) 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 1251204424000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1552282760808).

1251204424000 is an abundant number, since it is smaller than the sum of its proper divisors (1853361097616).

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

1251204424000 is an equidigital number, since it uses as much as digits as its factorization.

1251204424000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300741 (or 300721 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

Adding to 1251204424000 its reverse (4244021521), we get a palindrome (1255448445521).

The spelling of 1251204424000 in words is "one trillion, two hundred fifty-one billion, two hundred four million, four hundred twenty-four thousand".