21246544 has 40 divisors (see below), whose sum is σ = 45666720. Its totient is φ = 9494400.

The previous prime is 21246539. The next prime is 21246551. The reversal of 21246544 is 44564212.

It is a congruent number.

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, 9747 + ... + 11725.

It is an arithmetic number, because the mean of its divisors is an integer number (1141668).

Almost surely, 2^21246544 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 21246544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22833360).

21246544 is an abundant number, since it is smaller than the sum of its proper divisors (24420176).

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

21246544 is a wasteful number, since it uses less digits than its factorization.

21246544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2059 (or 2053 counting only the distinct ones).

The product of its digits is 7680, while the sum is 28.

The square root of 21246544 is about 4609.3973575729. The cubic root of 21246544 is about 276.9678962911.

It can be divided in two parts, 2124 and 6544, that added together give a palindrome (8668).

The spelling of 21246544 in words is "twenty-one million, two hundred forty-six thousand, five hundred forty-four".