1155421103 has 16 divisors (see below), whose sum is σ = 1263804000. Its totient is φ = 1052134272.

The previous prime is 1155421093. The next prime is 1155421153. The reversal of 1155421103 is 3011245511.

It is not a de Polignac number, because 1155421103 - 2⁶ = 1155421039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155421153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121601 + ... + 130757.

It is an arithmetic number, because the mean of its divisors is an integer number (78987750).

Almost surely, 2^1155421103 is an apocalyptic number.

1155421103 is a deficient number, since it is larger than the sum of its proper divisors (108382897).

1155421103 is a wasteful number, since it uses less digits than its factorization.

1155421103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9434.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 1155421103 is about 33991.4857427562. The cubic root of 1155421103 is about 1049.3332435130. Note that the first 3 decimals are identical.

Adding to 1155421103 its reverse (3011245511), we get a palindrome (4166666614).

The spelling of 1155421103 in words is "one billion, one hundred fifty-five million, four hundred twenty-one thousand, one hundred three".