21323244 has 24 divisors (see below), whose sum is σ = 52373440. Its totient is φ = 6733584.

The previous prime is 21323209. The next prime is 21323261. The reversal of 21323244 is 44232312.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21323244.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46534 + ... + 46989.

Almost surely, 2^21323244 is an apocalyptic number.

It is an amenable number.

21323244 is an abundant number, since it is smaller than the sum of its proper divisors (31050196).

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

21323244 is a wasteful number, since it uses less digits than its factorization.

21323244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93549 (or 93547 counting only the distinct ones).

The product of its digits is 1152, while the sum is 21.

The square root of 21323244 is about 4617.7098219789. The cubic root of 21323244 is about 277.3007806395.

Adding to 21323244 its reverse (44232312), we get a palindrome (65555556).

The spelling of 21323244 in words is "twenty-one million, three hundred twenty-three thousand, two hundred forty-four".