21225032 has 16 divisors (see below), whose sum is σ = 40037760. Its totient is φ = 10548304.

The previous prime is 21224989. The next prime is 21225037. The reversal of 21225032 is 23052212.

It is a self number, because there is not a number n which added to its sum of digits gives 21225032.

It is not an unprimeable number, because it can be changed into a prime (21225037) 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, 6608 + ... + 9279.

It is an arithmetic number, because the mean of its divisors is an integer number (2502360).

Almost surely, 2^21225032 is an apocalyptic number.

It is an amenable number.

21225032 is a deficient number, since it is larger than the sum of its proper divisors (18812728).

21225032 is a wasteful number, since it uses less digits than its factorization.

21225032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16060 (or 16056 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 21225032 is about 4607.0632728453. The cubic root of 21225032 is about 276.8743886070.

Adding to 21225032 its reverse (23052212), we get a palindrome (44277244).

The spelling of 21225032 in words is "twenty-one million, two hundred twenty-five thousand, thirty-two".