21444760 has 32 divisors (see below), whose sum is σ = 48756960. Its totient is φ = 8487936.

The previous prime is 21444751. The next prime is 21444767. The reversal of 21444760 is 6744412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1117 + ... + 6643.

It is an arithmetic number, because the mean of its divisors is an integer number (1523655).

Almost surely, 2^21444760 is an apocalyptic number.

21444760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21444760 is an abundant number, since it is smaller than the sum of its proper divisors (27312200).

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

21444760 is a wasteful number, since it uses less digits than its factorization.

21444760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5635 (or 5631 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 21444760 is about 4630.8487343035. The cubic root of 21444760 is about 277.8265398248.

The spelling of 21444760 in words is "twenty-one million, four hundred forty-four thousand, seven hundred sixty".