1251421013441 has 4 divisors (see below), whose sum is σ = 1271936112084. Its totient is φ = 1230905914800.

The previous prime is 1251421013419. The next prime is 1251421013443. The reversal of 1251421013441 is 1443101241521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 167956530625 + 1083464482816 = 409825^2 + 1040896^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251421013441 - 2¹⁰ = 1251421012417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251421013443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10257549230 + ... + 10257549351.

It is an arithmetic number, because the mean of its divisors is an integer number (317984028021).

Almost surely, 2^{1251421013441} is an apocalyptic number.

It is an amenable number.

1251421013441 is a deficient number, since it is larger than the sum of its proper divisors (20515098643).

1251421013441 is an equidigital number, since it uses as much as digits as its factorization.

1251421013441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20515098642.

The product of its (nonzero) digits is 3840, while the sum is 29.

Adding to 1251421013441 its reverse (1443101241521), we get a palindrome (2694522254962).

The spelling of 1251421013441 in words is "one trillion, two hundred fifty-one billion, four hundred twenty-one million, thirteen thousand, four hundred forty-one".