1321531445252 has 24 divisors (see below), whose sum is σ = 2419131724800. Its totient is φ = 630491438016.

The previous prime is 1321531445249. The next prime is 1321531445257. The reversal of 1321531445252 is 2525441351231.

It is not an unprimeable number, because it can be changed into a prime (1321531445257) 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, 17522852 + ... + 17598107.

It is an arithmetic number, because the mean of its divisors is an integer number (100797155200).

Almost surely, 2^{1321531445252} is an apocalyptic number.

It is an amenable number.

1321531445252 is a deficient number, since it is larger than the sum of its proper divisors (1097600279548).

1321531445252 is a wasteful number, since it uses less digits than its factorization.

1321531445252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35121395 (or 35121393 counting only the distinct ones).

The product of its digits is 144000, while the sum is 38.

Adding to 1321531445252 its reverse (2525441351231), we get a palindrome (3846972796483).

The spelling of 1321531445252 in words is "one trillion, three hundred twenty-one billion, five hundred thirty-one million, four hundred forty-five thousand, two hundred fifty-two".