21444704 has 12 divisors (see below), whose sum is σ = 42219324. Its totient is φ = 10722336.

The previous prime is 21444697. The next prime is 21444713. The reversal of 21444704 is 40744412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335042 + ... + 335105.

It is an arithmetic number, because the mean of its divisors is an integer number (3518277).

Almost surely, 2^21444704 is an apocalyptic number.

It is an amenable number.

21444704 is a deficient number, since it is larger than the sum of its proper divisors (20774620).

21444704 is an equidigital number, since it uses as much as digits as its factorization.

21444704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670157 (or 670149 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 26.

The square root of 21444704 is about 4630.8426878917. The cubic root of 21444704 is about 277.8262979895.

The spelling of 21444704 in words is "twenty-one million, four hundred forty-four thousand, seven hundred four".