21673033 has 4 divisors (see below), whose sum is σ = 21838608. Its totient is φ = 21507460.

The previous prime is 21673031. The next prime is 21673039. The reversal of 21673033 is 33037612.

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 a cyclic number.

It is not a de Polignac number, because 21673033 - 2¹ = 21673031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21672989 and 21673007.

It is not an unprimeable number, because it can be changed into a prime (21673031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82591 + ... + 82852.

It is an arithmetic number, because the mean of its divisors is an integer number (5459652).

Almost surely, 2^21673033 is an apocalyptic number.

It is an amenable number.

21673033 is a deficient number, since it is larger than the sum of its proper divisors (165575).

21673033 is a wasteful number, since it uses less digits than its factorization.

21673033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165574.

The product of its (nonzero) digits is 2268, while the sum is 25.

The square root of 21673033 is about 4655.4304849283. The cubic root of 21673033 is about 278.8088557712.

The spelling of 21673033 in words is "twenty-one million, six hundred seventy-three thousand, thirty-three".