1155332421 has 12 divisors (see below), whose sum is σ = 1726359180. Its totient is φ = 743662080.

The previous prime is 1155332417. The next prime is 1155332429. The reversal of 1155332421 is 1242335511.

It can be written as a sum of positive squares in 2 ways, for example, as 609596100 + 545736321 = 24690^2 + 23361^2 .

It is not a de Polignac number, because 1155332421 - 2² = 1155332417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155332429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2213020 + ... + 2213541.

It is an arithmetic number, because the mean of its divisors is an integer number (143863265).

Almost surely, 2^1155332421 is an apocalyptic number.

It is an amenable number.

1155332421 is a deficient number, since it is larger than the sum of its proper divisors (571026759).

1155332421 is a wasteful number, since it uses less digits than its factorization.

1155332421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4426596 (or 4426593 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 1155332421 is about 33990.1812440005. The cubic root of 1155332421 is about 1049.3063963455.

Adding to 1155332421 its reverse (1242335511), we get a palindrome (2397667932).

The spelling of 1155332421 in words is "one billion, one hundred fifty-five million, three hundred thirty-two thousand, four hundred twenty-one".