13021021 has 16 divisors (see below), whose sum is σ = 14531328. Its totient is φ = 11592000.

The previous prime is 13021009. The next prime is 13021027. The reversal of 13021021 is 12012031.

It is a cyclic number.

It is not a de Polignac number, because 13021021 - 2⁷ = 13020893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13020989 and 13021007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13021027) 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, 61606 + ... + 61816.

It is an arithmetic number, because the mean of its divisors is an integer number (908208).

Almost surely, 2^13021021 is an apocalyptic number.

It is an amenable number.

13021021 is a deficient number, since it is larger than the sum of its proper divisors (1510307).

13021021 is a wasteful number, since it uses less digits than its factorization.

13021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 13021021 is about 3608.4651861976. The cubic root of 13021021 is about 235.2601374618.

Adding to 13021021 its reverse (12012031), we get a palindrome (25033052).

The spelling of 13021021 in words is "thirteen million, twenty-one thousand, twenty-one".