21818032 has 10 divisors (see below), whose sum is σ = 42272468. Its totient is φ = 10909008.

The previous prime is 21818029. The next prime is 21818051. The reversal of 21818032 is 23081812.

It is a junction number, because it is equal to n+sod(n) for n = 21817988 and 21818006.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 681798 + ... + 681829.

Almost surely, 2^21818032 is an apocalyptic number.

It is an amenable number.

21818032 is a deficient number, since it is larger than the sum of its proper divisors (20454436).

21818032 is a wasteful number, since it uses less digits than its factorization.

21818032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363635 (or 1363629 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 21818032 is about 4670.9776278634. The cubic root of 21818032 is about 279.4292455228.

Adding to 21818032 its reverse (23081812), we get a palindrome (44899844).

The spelling of 21818032 in words is "twenty-one million, eight hundred eighteen thousand, thirty-two".