21633016 has 8 divisors (see below), whose sum is σ = 40561920. Its totient is φ = 10816504.

The previous prime is 21633011. The next prime is 21633023. The reversal of 21633016 is 61033612.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21633011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1352056 + ... + 1352071.

It is an arithmetic number, because the mean of its divisors is an integer number (5070240).

Almost surely, 2^21633016 is an apocalyptic number.

It is an amenable number.

21633016 is a deficient number, since it is larger than the sum of its proper divisors (18928904).

21633016 is a wasteful number, since it uses less digits than its factorization.

21633016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2704133 (or 2704129 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 21633016 is about 4651.1306152375. The cubic root of 21633016 is about 278.6371528714.

Adding to 21633016 its reverse (61033612), we get a palindrome (82666628).

The spelling of 21633016 in words is "twenty-one million, six hundred thirty-three thousand, sixteen".