13011021 has 6 divisors (see below), whose sum is σ = 18793710. Its totient is φ = 8674008.

The previous prime is 13011007. The next prime is 13011059. The reversal of 13011021 is 12011031.

It can be written as a sum of positive squares in only one way, i.e., 8122500 + 4888521 = 2850^2 + 2211^2 .

It is not a de Polignac number, because 13011021 - 2¹¹ = 13008973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 1445669 = 13011021 / (1 + 3 + 0 + 1 + 1 + 0 + 2 + 1).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13010994 and 13011012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13011071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 722826 + ... + 722843.

It is an arithmetic number, because the mean of its divisors is an integer number (3132285).

Almost surely, 2^13011021 is an apocalyptic number.

It is an amenable number.

13011021 is a deficient number, since it is larger than the sum of its proper divisors (5782689).

13011021 is a wasteful number, since it uses less digits than its factorization.

13011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1445675 (or 1445672 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 13011021 is about 3607.0792893974. The cubic root of 13011021 is about 235.1998963105.

Adding to 13011021 its reverse (12011031), we get a palindrome (25022052).

The spelling of 13011021 in words is "thirteen million, eleven thousand, twenty-one".