1155305221252 has 96 divisors (see below), whose sum is σ = 2533187543040. Its totient is φ = 448824620160.

The previous prime is 1155305221223. The next prime is 1155305221261. The reversal of 1155305221252 is 2521225035511.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20739477 + ... + 20795107.

It is an arithmetic number, because the mean of its divisors is an integer number (26387370240).

Almost surely, 2^{1155305221252} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1155305221252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1266593771520).

1155305221252 is an abundant number, since it is smaller than the sum of its proper divisors (1377882321788).

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

1155305221252 is a wasteful number, since it uses less digits than its factorization.

1155305221252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56681 (or 56679 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 34.

The spelling of 1155305221252 in words is "one trillion, one hundred fifty-five billion, three hundred five million, two hundred twenty-one thousand, two hundred fifty-two".