21732033 has 8 divisors (see below), whose sum is σ = 30235968. Its totient is φ = 13858064.

The previous prime is 21732017. The next prime is 21732037. The reversal of 21732033 is 33023712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21732033 - 2⁴ = 21732017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21732037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157410 + ... + 157547.

It is an arithmetic number, because the mean of its divisors is an integer number (3779496).

Almost surely, 2^21732033 is an apocalyptic number.

21732033 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21732033 is a deficient number, since it is larger than the sum of its proper divisors (8503935).

21732033 is a wasteful number, since it uses less digits than its factorization.

21732033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314983.

The product of its (nonzero) digits is 756, while the sum is 21.

The square root of 21732033 is about 4661.7628639818. The cubic root of 21732033 is about 279.0616248556.

Adding to 21732033 its reverse (33023712), we get a palindrome (54755745).

The spelling of 21732033 in words is "twenty-one million, seven hundred thirty-two thousand, thirty-three".