21322012 has 24 divisors (see below), whose sum is σ = 41229216. Its totient is φ = 9596928.

The previous prime is 21322003. The next prime is 21322019. The reversal of 21322012 is 21022312.

It is a junction number, because it is equal to n+sod(n) for n = 21321983 and 21322001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5253 + ... + 8380.

It is an arithmetic number, because the mean of its divisors is an integer number (1717884).

Almost surely, 2^21322012 is an apocalyptic number.

It is an amenable number.

21322012 is a deficient number, since it is larger than the sum of its proper divisors (19907204).

21322012 is a wasteful number, since it uses less digits than its factorization.

21322012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13677 (or 13675 counting only the distinct ones).

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

The square root of 21322012 is about 4617.5764205912. The cubic root of 21322012 is about 277.2954399708.

Adding to 21322012 its reverse (21022312), we get a palindrome (42344324).

The spelling of 21322012 in words is "twenty-one million, three hundred twenty-two thousand, twelve".