21633126 has 16 divisors (see below), whose sum is σ = 43579200. Its totient is φ = 7158888.

The previous prime is 21633119. The next prime is 21633127. The reversal of 21633126 is 62133612.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21633096 and 21633105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21633127) 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, 12136 + ... + 13803.

It is an arithmetic number, because the mean of its divisors is an integer number (2723700).

Almost surely, 2^21633126 is an apocalyptic number.

21633126 is an abundant number, since it is smaller than the sum of its proper divisors (21946074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21633126 is a wasteful number, since it uses less digits than its factorization.

21633126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26083.

The product of its digits is 1296, while the sum is 24.

The square root of 21633126 is about 4651.1424403043. The cubic root of 21633126 is about 278.6376251439.

Adding to 21633126 its reverse (62133612), we get a palindrome (83766738).

The spelling of 21633126 in words is "twenty-one million, six hundred thirty-three thousand, one hundred twenty-six".