21229832 has 16 divisors (see below), whose sum is σ = 42868140. Its totient is φ = 9798336.

The previous prime is 21229829. The next prime is 21229837. The reversal of 21229832 is 23892212.

It can be written as a sum of positive squares in 2 ways, for example, as 16760836 + 4468996 = 4094^2 + 2114^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21229795 and 21229804.

It is not an unprimeable number, because it can be changed into a prime (21229837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101963 + ... + 102170.

Almost surely, 2^21229832 is an apocalyptic number.

It is an amenable number.

21229832 is an abundant number, since it is smaller than the sum of its proper divisors (21638308).

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

21229832 is a wasteful number, since it uses less digits than its factorization.

21229832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204152 (or 204148 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 21229832 is about 4607.5841826276. The cubic root of 21229832 is about 276.8952585700.

The spelling of 21229832 in words is "twenty-one million, two hundred twenty-nine thousand, eight hundred thirty-two".