21630032 has 40 divisors (see below), whose sum is σ = 43375200. Its totient is φ = 10442880.

The previous prime is 21630031. The next prime is 21630061. The reversal of 21630032 is 23003612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21630031) 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, 102407 + ... + 102617.

It is an arithmetic number, because the mean of its divisors is an integer number (1084380).

Almost surely, 2^21630032 is an apocalyptic number.

It is an amenable number.

21630032 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

21630032 is a wasteful number, since it uses less digits than its factorization.

21630032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411 (or 405 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 21630032 is about 4650.8098219557. The cubic root of 21630032 is about 278.6243407960.

Adding to 21630032 its reverse (23003612), we get a palindrome (44633644).

The spelling of 21630032 in words is "twenty-one million, six hundred thirty thousand, thirty-two".