21223448 has 16 divisors (see below), whose sum is σ = 39842880. Its totient is φ = 10598688.

The previous prime is 21223427. The next prime is 21223453. The reversal of 21223448 is 84432212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11690 + ... + 13382.

It is an arithmetic number, because the mean of its divisors is an integer number (2490180).

Almost surely, 2^21223448 is an apocalyptic number.

It is an amenable number.

21223448 is a deficient number, since it is larger than the sum of its proper divisors (18619432).

21223448 is a wasteful number, since it uses less digits than its factorization.

21223448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3266 (or 3262 counting only the distinct ones).

The product of its digits is 3072, while the sum is 26.

The square root of 21223448 is about 4606.8913596915. The cubic root of 21223448 is about 276.8675008287.

The spelling of 21223448 in words is "twenty-one million, two hundred twenty-three thousand, four hundred forty-eight".