13021145 has 16 divisors (see below), whose sum is σ = 16362000. Its totient is φ = 9934848.

The previous prime is 13021139. The next prime is 13021163. The reversal of 13021145 is 54112031.

It can be written as a sum of positive squares in 8 ways, for example, as 1317904 + 11703241 = 1148^2 + 3421^2 .

It is a cyclic number.

It is not a de Polignac number, because 13021145 - 2¹⁰ = 13020121 is a prime.

It is a super-2 number, since 2×13021145² = 339100434222050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12401 + ... + 13409.

It is an arithmetic number, because the mean of its divisors is an integer number (1022625).

Almost surely, 2^13021145 is an apocalyptic number.

It is an amenable number.

13021145 is a deficient number, since it is larger than the sum of its proper divisors (3340855).

13021145 is a wasteful number, since it uses less digits than its factorization.

13021145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 13021145 is about 3608.4823679769. The cubic root of 13021145 is about 235.2608842585.

Adding to 13021145 its reverse (54112031), we get a palindrome (67133176).

The spelling of 13021145 in words is "thirteen million, twenty-one thousand, one hundred forty-five".