1251440321241 has 8 divisors (see below), whose sum is σ = 1820276830944. Its totient is φ = 758448679520.

The previous prime is 1251440321233. The next prime is 1251440321293. The reversal of 1251440321241 is 1421230441521.

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 1251440321241 - 2³ = 1251440321233 is a prime.

It is a super-2 number, since 2×1251440321241² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1251440321199 and 1251440321208.

It is not an unprimeable number, because it can be changed into a prime (1251440321141) 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, 18961216956 + ... + 18961217021.

It is an arithmetic number, because the mean of its divisors is an integer number (227534603868).

Almost surely, 2^{1251440321241} is an apocalyptic number.

1251440321241 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1251440321241 is a deficient number, since it is larger than the sum of its proper divisors (568836509703).

1251440321241 is a wasteful number, since it uses less digits than its factorization.

1251440321241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37922433991.

The product of its (nonzero) digits is 7680, while the sum is 30.

Adding to 1251440321241 its reverse (1421230441521), we get a palindrome (2672670762762).

The spelling of 1251440321241 in words is "one trillion, two hundred fifty-one billion, four hundred forty million, three hundred twenty-one thousand, two hundred forty-one".