21633022 has 4 divisors (see below), whose sum is σ = 32449536. Its totient is φ = 10816510.

The previous prime is 21633011. The next prime is 21633023. The reversal of 21633022 is 22033612.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21633023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5408254 + ... + 5408257.

It is an arithmetic number, because the mean of its divisors is an integer number (8112384).

Almost surely, 2^21633022 is an apocalyptic number.

21633022 is a deficient number, since it is larger than the sum of its proper divisors (10816514).

21633022 is a wasteful number, since it uses less digits than its factorization.

21633022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10816513.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 21633022 is about 4651.1312602420. The cubic root of 21633022 is about 278.6371786318.

Adding to 21633022 its reverse (22033612), we get a palindrome (43666634).

The spelling of 21633022 in words is "twenty-one million, six hundred thirty-three thousand, twenty-two".