1321531445251 has 8 divisors (see below), whose sum is σ = 1364365952000. Its totient is φ = 1278709717320.

The previous prime is 1321531445249. The next prime is 1321531445257. The reversal of 1321531445251 is 1525441351231.

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 1321531445251 - 2¹ = 1321531445249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321531445251.

It is not an unprimeable number, because it can be changed into a prime (1321531445257) 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 7 ways as a sum of consecutive naturals, for example, 2984301 + ... + 3398398.

It is an arithmetic number, because the mean of its divisors is an integer number (170545744000).

Almost surely, 2^{1321531445251} is an apocalyptic number.

1321531445251 is a deficient number, since it is larger than the sum of its proper divisors (42834506749).

1321531445251 is an equidigital number, since it uses as much as digits as its factorization.

1321531445251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6389409.

The product of its digits is 72000, while the sum is 37.

Adding to 1321531445251 its reverse (1525441351231), we get a palindrome (2846972796482).

The spelling of 1321531445251 in words is "one trillion, three hundred twenty-one billion, five hundred thirty-one million, four hundred forty-five thousand, two hundred fifty-one".