21221032 has 32 divisors (see below), whose sum is σ = 48150720. Its totient is φ = 8559360.

The previous prime is 21221021. The next prime is 21221033. The reversal of 21221032 is 23012212.

It is not an unprimeable number, because it can be changed into a prime (21221033) 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, 10194 + ... + 12097.

It is an arithmetic number, because the mean of its divisors is an integer number (1504710).

Almost surely, 2^21221032 is an apocalyptic number.

It is an amenable number.

21221032 is an abundant number, since it is smaller than the sum of its proper divisors (26929688).

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

21221032 is a wasteful number, since it uses less digits than its factorization.

21221032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22321 (or 22317 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21221032 is about 4606.6291363642. The cubic root of 21221032 is about 276.8569945675.

Adding to 21221032 its reverse (23012212), we get a palindrome (44233244).

The spelling of 21221032 in words is "twenty-one million, two hundred twenty-one thousand, thirty-two".