21037089 has 4 divisors (see below), whose sum is σ = 28049456. Its totient is φ = 14024724.

The previous prime is 21037061. The next prime is 21037103. The reversal of 21037089 is 98073012.

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 not a de Polignac number, because 21037089 - 2⁸ = 21036833 is a prime.

It is a super-2 number, since 2×21037089² = 885118227187842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21037589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3506179 + ... + 3506184.

It is an arithmetic number, because the mean of its divisors is an integer number (7012364).

Almost surely, 2^21037089 is an apocalyptic number.

It is an amenable number.

21037089 is a deficient number, since it is larger than the sum of its proper divisors (7012367).

21037089 is an equidigital number, since it uses as much as digits as its factorization.

21037089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7012366.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 21037089 is about 4586.6206514165. The cubic root of 21037089 is about 276.0547439194.

The spelling of 21037089 in words is "twenty-one million, thirty-seven thousand, eighty-nine".