21423448 has 16 divisors (see below), whose sum is σ = 40927680. Its totient is φ = 10509408.

The previous prime is 21423421. The next prime is 21423487. The reversal of 21423448 is 84432412.

It is a happy number.

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, 24840 + ... + 25687.

It is an arithmetic number, because the mean of its divisors is an integer number (2557980).

Almost surely, 2^21423448 is an apocalyptic number.

It is an amenable number.

21423448 is a deficient number, since it is larger than the sum of its proper divisors (19504232).

21423448 is a wasteful number, since it uses less digits than its factorization.

21423448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50586 (or 50582 counting only the distinct ones).

The product of its digits is 6144, while the sum is 28.

The square root of 21423448 is about 4628.5470722463. The cubic root of 21423448 is about 277.7344737947.

The spelling of 21423448 in words is "twenty-one million, four hundred twenty-three thousand, four hundred forty-eight".