21037373 has 4 divisors (see below), whose sum is σ = 24042720. Its totient is φ = 18032028.

The previous prime is 21037369. The next prime is 21037409. The reversal of 21037373 is 37373012.

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 21037373 - 2² = 21037369 is a prime.

It is a super-2 number, since 2×21037373² = 885142125482258, 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 (21039373) 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, 1502663 + ... + 1502676.

It is an arithmetic number, because the mean of its divisors is an integer number (6010680).

Almost surely, 2^21037373 is an apocalyptic number.

It is an amenable number.

21037373 is a deficient number, since it is larger than the sum of its proper divisors (3005347).

21037373 is an equidigital number, since it uses as much as digits as its factorization.

21037373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3005346.

The product of its (nonzero) digits is 2646, while the sum is 26.

The square root of 21037373 is about 4586.6516109249. The cubic root of 21037373 is about 276.0559861571.

The spelling of 21037373 in words is "twenty-one million, thirty-seven thousand, three hundred seventy-three".