1251054255321 has 12 divisors (see below), whose sum is σ = 1946084397348. Its totient is φ = 769879541664.

The previous prime is 1251054255317. The next prime is 1251054255329. The reversal of 1251054255321 is 1235524501521.

1251054255321 is a `hidden beast` number, since 1 + 2 + 51 + 0 + 54 + 2 + 553 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 398746783296 + 852307472025 = 631464^2 + 923205^2 .

It is not a de Polignac number, because 1251054255321 - 2² = 1251054255317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1251054255329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5346385590 + ... + 5346385823.

It is an arithmetic number, because the mean of its divisors is an integer number (162173699779).

Almost surely, 2^{1251054255321} is an apocalyptic number.

It is an amenable number.

1251054255321 is a deficient number, since it is larger than the sum of its proper divisors (695030142027).

1251054255321 is a wasteful number, since it uses less digits than its factorization.

1251054255321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10692771432 (or 10692771429 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 36.

Adding to 1251054255321 its reverse (1235524501521), we get a palindrome (2486578756842).

The spelling of 1251054255321 in words is "one trillion, two hundred fifty-one billion, fifty-four million, two hundred fifty-five thousand, three hundred twenty-one".