1251344021413 has 8 divisors (see below), whose sum is σ = 1283113802432. Its totient is φ = 1219959328896.

The previous prime is 1251344021393. The next prime is 1251344021471. The reversal of 1251344021413 is 3141204431521.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1251344021413 - 2²⁵ = 1251310466981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251344028413) 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 7 ways as a sum of consecutive naturals, for example, 96265545 + ... + 96278542.

It is an arithmetic number, because the mean of its divisors is an integer number (160389225304).

Almost surely, 2^{1251344021413} is an apocalyptic number.

It is an amenable number.

1251344021413 is a deficient number, since it is larger than the sum of its proper divisors (31769781019).

1251344021413 is an equidigital number, since it uses as much as digits as its factorization.

1251344021413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192544251.

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 1251344021413 its reverse (3141204431521), we get a palindrome (4392548452934).

The spelling of 1251344021413 in words is "one trillion, two hundred fifty-one billion, three hundred forty-four million, twenty-one thousand, four hundred thirteen".