21037383 has 12 divisors (see below), whose sum is σ = 31435560. Its totient is φ = 13541136.

The previous prime is 21037369. The next prime is 21037409. The reversal of 21037383 is 38373012.

21037383 is a `hidden beast` number, since 210 + 373 + 83 = 666.

It is not a de Polignac number, because 21037383 - 2²⁴ = 4260167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21037283) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40041 + ... + 40562.

It is an arithmetic number, because the mean of its divisors is an integer number (2619630).

Almost surely, 2^21037383 is an apocalyptic number.

21037383 is a deficient number, since it is larger than the sum of its proper divisors (10398177).

21037383 is a wasteful number, since it uses less digits than its factorization.

21037383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80638 (or 80635 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 21037383 is about 4586.6527010446. The cubic root of 21037383 is about 276.0560298976.

The spelling of 21037383 in words is "twenty-one million, thirty-seven thousand, three hundred eighty-three".