13190021 has 4 divisors (see below), whose sum is σ = 14204652. Its totient is φ = 12175392.

The previous prime is 13190003. The next prime is 13190027. The reversal of 13190021 is 12009131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12009131 = 61 ⋅196871.

It can be written as a sum of positive squares in 2 ways, for example, as 3648100 + 9541921 = 1910^2 + 3089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13190021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13190027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507296 + ... + 507321.

It is an arithmetic number, because the mean of its divisors is an integer number (3551163).

Almost surely, 2^13190021 is an apocalyptic number.

It is an amenable number.

13190021 is a deficient number, since it is larger than the sum of its proper divisors (1014631).

13190021 is a wasteful number, since it uses less digits than its factorization.

13190021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014630.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 13190021 is about 3631.8068505910. The cubic root of 13190021 is about 236.2735803195.

Adding to 13190021 its reverse (12009131), we get a palindrome (25199152).

The spelling of 13190021 in words is "thirteen million, one hundred ninety thousand, twenty-one".