21321032 has 24 divisors (see below), whose sum is σ = 41416050. Its totient is φ = 10289664.

The previous prime is 21321031. The next prime is 21321067. The reversal of 21321032 is 23012312.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 20557156 + 763876 = 4534^2 + 874^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21320998 and 21321016.

It is not an unprimeable number, because it can be changed into a prime (21321031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5144 + ... + 8312.

Almost surely, 2^21321032 is an apocalyptic number.

It is an amenable number.

21321032 is a deficient number, since it is larger than the sum of its proper divisors (20095018).

21321032 is a wasteful number, since it uses less digits than its factorization.

21321032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3233 (or 3200 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21321032 is about 4617.4703030989. The cubic root of 21321032 is about 277.2911915648.

Adding to 21321032 its reverse (23012312), we get a palindrome (44333344).

The spelling of 21321032 in words is "twenty-one million, three hundred twenty-one thousand, thirty-two".