13038821 has 4 divisors (see below), whose sum is σ = 13051500. Its totient is φ = 13026144.

The previous prime is 13038799. The next prime is 13038827. The reversal of 13038821 is 12883031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7230721 + 5808100 = 2689^2 + 2410^2 .

It is a cyclic number.

It is not a de Polignac number, because 13038821 - 2⁶ = 13038757 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 (13038827) 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, 4646 + ... + 6903.

It is an arithmetic number, because the mean of its divisors is an integer number (3262875).

Almost surely, 2^13038821 is an apocalyptic number.

It is an amenable number.

13038821 is a deficient number, since it is larger than the sum of its proper divisors (12679).

13038821 is a wasteful number, since it uses less digits than its factorization.

13038821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12678.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 13038821 is about 3610.9307664368. The cubic root of 13038821 is about 235.3672904442.

The spelling of 13038821 in words is "thirteen million, thirty-eight thousand, eight hundred twenty-one".