21322044 has 36 divisors (see below), whose sum is σ = 54297880. Its totient is φ = 7054560.

The previous prime is 21322043. The next prime is 21322051. The reversal of 21322044 is 44022312.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322043) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2874 + ... + 7134.

Almost surely, 2^21322044 is an apocalyptic number.

It is an amenable number.

21322044 is an abundant number, since it is smaller than the sum of its proper divisors (32975836).

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

21322044 is a wasteful number, since it uses less digits than its factorization.

21322044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4410 (or 4405 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 21322044 is about 4617.5798856111. The cubic root of 21322044 is about 277.2955786921.

Adding to 21322044 its reverse (44022312), we get a palindrome (65344356).

The spelling of 21322044 in words is "twenty-one million, three hundred twenty-two thousand, forty-four".