1251043401121 has 8 divisors (see below), whose sum is σ = 1263117589920. Its totient is φ = 1238976290208.

The previous prime is 1251043401061. The next prime is 1251043401131. The reversal of 1251043401121 is 1211043401521.

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 1251043401121 - 2¹⁵ = 1251043368353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251043401131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1413916 + ... + 2121613.

It is an arithmetic number, because the mean of its divisors is an integer number (157889698740).

Almost surely, 2^{1251043401121} is an apocalyptic number.

It is an amenable number.

1251043401121 is a deficient number, since it is larger than the sum of its proper divisors (12074188799).

1251043401121 is a wasteful number, since it uses less digits than its factorization.

1251043401121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3538943.

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 1251043401121 its reverse (1211043401521), we get a palindrome (2462086802642).

The spelling of 1251043401121 in words is "one trillion, two hundred fifty-one billion, forty-three million, four hundred one thousand, one hundred twenty-one".