21058933 has 4 divisors (see below), whose sum is σ = 24067360. Its totient is φ = 18050508.

The previous prime is 21058931. The next prime is 21058943. The reversal of 21058933 is 33985012.

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 21058933 - 2¹ = 21058931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21058895 and 21058904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21058931) 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, 1504203 + ... + 1504216.

It is an arithmetic number, because the mean of its divisors is an integer number (6016840).

Almost surely, 2^21058933 is an apocalyptic number.

It is an amenable number.

21058933 is a deficient number, since it is larger than the sum of its proper divisors (3008427).

21058933 is an equidigital number, since it uses as much as digits as its factorization.

21058933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3008426.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 21058933 is about 4589.0013074742. The cubic root of 21058933 is about 276.1502586217.

The spelling of 21058933 in words is "twenty-one million, fifty-eight thousand, nine hundred thirty-three".