1321441155252 has 144 divisors (see below), whose sum is σ = 3478789903680. Its totient is φ = 422431027200.

The previous prime is 1321441155227. The next prime is 1321441155257. The reversal of 1321441155252 is 2525511441231.

1321441155252 is a `hidden beast` number, since 1 + 3 + 2 + 1 + 44 + 11 + 552 + 52 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321441155257) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 139226227 + ... + 139235717.

It is an arithmetic number, because the mean of its divisors is an integer number (24158263220).

Almost surely, 2^{1321441155252} is an apocalyptic number.

1321441155252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321441155252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1739394951840).

1321441155252 is an abundant number, since it is smaller than the sum of its proper divisors (2157348748428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321441155252 is a wasteful number, since it uses less digits than its factorization.

1321441155252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10414 (or 10409 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

Adding to 1321441155252 its reverse (2525511441231), we get a palindrome (3846952596483).

The spelling of 1321441155252 in words is "one trillion, three hundred twenty-one billion, four hundred forty-one million, one hundred fifty-five thousand, two hundred fifty-two".