21322844 has 6 divisors (see below), whose sum is σ = 37314984. Its totient is φ = 10661420.

The previous prime is 21322799. The next prime is 21322849. The reversal of 21322844 is 44822312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2665352 + ... + 2665359.

It is an arithmetic number, because the mean of its divisors is an integer number (6219164).

Almost surely, 2^21322844 is an apocalyptic number.

It is an amenable number.

21322844 is a deficient number, since it is larger than the sum of its proper divisors (15992140).

21322844 is a wasteful number, since it uses less digits than its factorization.

21322844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5330715 (or 5330713 counting only the distinct ones).

The product of its digits is 3072, while the sum is 26.

The square root of 21322844 is about 4617.6665102625. Note that the first 3 decimals coincide. The cubic root of 21322844 is about 277.2990466787.

The spelling of 21322844 in words is "twenty-one million, three hundred twenty-two thousand, eight hundred forty-four".