21038413 has 4 divisors (see below), whose sum is σ = 22951008. Its totient is φ = 19125820.

The previous prime is 21038393. The next prime is 21038419. The reversal of 21038413 is 31483012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21038413 - 2⁹ = 21037901 is a prime.

It is a super-2 number, since 2×21038413² = 885229643117138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21038419) 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, 956281 + ... + 956302.

It is an arithmetic number, because the mean of its divisors is an integer number (5737752).

Almost surely, 2^21038413 is an apocalyptic number.

It is an amenable number.

21038413 is a deficient number, since it is larger than the sum of its proper divisors (1912595).

21038413 is a wasteful number, since it uses less digits than its factorization.

21038413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1912594.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21038413 is about 4586.7649819889. The cubic root of 21038413 is about 276.0605351011.

The spelling of 21038413 in words is "twenty-one million, thirty-eight thousand, four hundred thirteen".