21038489 has 4 divisors (see below), whose sum is σ = 21133056. Its totient is φ = 20943924.

The previous prime is 21038483. The next prime is 21038519. The reversal of 21038489 is 98483012.

It is a happy number.

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 21038489 - 2²⁴ = 4261273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21038483) 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, 46949 + ... + 47394.

It is an arithmetic number, because the mean of its divisors is an integer number (5283264).

Almost surely, 2^21038489 is an apocalyptic number.

It is an amenable number.

21038489 is a deficient number, since it is larger than the sum of its proper divisors (94567).

21038489 is an equidigital number, since it uses as much as digits as its factorization.

21038489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94566.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 21038489 is about 4586.7732666876. The cubic root of 21038489 is about 276.0608675180.

The spelling of 21038489 in words is "twenty-one million, thirty-eight thousand, four hundred eighty-nine".