21672333 has 16 divisors (see below), whose sum is σ = 32423040. Its totient is φ = 14306112.

The previous prime is 21672323. The next prime is 21672337. The reversal of 21672333 is 33327612.

It is not a de Polignac number, because 21672333 - 2¹³ = 21664141 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21672297 and 21672306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21672337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1116 + ... + 6677.

It is an arithmetic number, because the mean of its divisors is an integer number (2026440).

Almost surely, 2^21672333 is an apocalyptic number.

It is an amenable number.

21672333 is a deficient number, since it is larger than the sum of its proper divisors (10750707).

21672333 is a wasteful number, since it uses less digits than its factorization.

21672333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7905 (or 7899 counting only the distinct ones).

The product of its digits is 4536, while the sum is 27.

The square root of 21672333 is about 4655.3553033039. The cubic root of 21672333 is about 278.8058540639.

Adding to 21672333 its reverse (33327612), we get a palindrome (54999945).

The spelling of 21672333 in words is "twenty-one million, six hundred seventy-two thousand, three hundred thirty-three".