21325044 has 48 divisors (see below), whose sum is σ = 53914112. Its totient is φ = 6521472.

The previous prime is 21325037. The next prime is 21325093. The reversal of 21325044 is 44052312.

It is a self number, because there is not a number n which added to its sum of digits gives 21325044.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34482 + ... + 35094.

Almost surely, 2^21325044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21325044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26957056).

21325044 is an abundant number, since it is smaller than the sum of its proper divisors (32589068).

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

21325044 is a wasteful number, since it uses less digits than its factorization.

21325044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856 (or 854 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 21325044 is about 4617.9047196754. The cubic root of 21325044 is about 277.3085831946.

Adding to 21325044 its reverse (44052312), we get a palindrome (65377356).

The spelling of 21325044 in words is "twenty-one million, three hundred twenty-five thousand, forty-four".