21038383 has 4 divisors (see below), whose sum is σ = 21047760. Its totient is φ = 21029008.

The previous prime is 21038363. The next prime is 21038389. The reversal of 21038383 is 38383012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21038383 - 2¹⁷ = 20907311 is a prime.

It is a super-2 number, since 2×21038383² = 885227118509378, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21038389) 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, 891 + ... + 6547.

It is an arithmetic number, because the mean of its divisors is an integer number (5261940).

Almost surely, 2^21038383 is an apocalyptic number.

21038383 is a deficient number, since it is larger than the sum of its proper divisors (9377).

21038383 is an equidigital number, since it uses as much as digits as its factorization.

21038383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9376.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 21038383 is about 4586.7617117090. The cubic root of 21038383 is about 276.0604038836.

The spelling of 21038383 in words is "twenty-one million, thirty-eight thousand, three hundred eighty-three".