21322364 has 24 divisors (see below), whose sum is σ = 43370880. Its totient is φ = 8982576.

The previous prime is 21322361. The next prime is 21322381. The reversal of 21322364 is 46322312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4802 + ... + 8105.

It is an arithmetic number, because the mean of its divisors is an integer number (1807120).

Almost surely, 2^21322364 is an apocalyptic number.

It is an amenable number.

21322364 is an abundant number, since it is smaller than the sum of its proper divisors (22048516).

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

21322364 is a wasteful number, since it uses less digits than its factorization.

21322364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12977 (or 12975 counting only the distinct ones).

The product of its digits is 1728, while the sum is 23.

The square root of 21322364 is about 4617.6145356667. The cubic root of 21322364 is about 277.2969658971.

Adding to 21322364 its reverse (46322312), we get a palindrome (67644676).

The spelling of 21322364 in words is "twenty-one million, three hundred twenty-two thousand, three hundred sixty-four".