21283244 has 12 divisors (see below), whose sum is σ = 37770768. Its totient is φ = 10491600.

The previous prime is 21283243. The next prime is 21283253. The reversal of 21283244 is 44238212.

It is not an unprimeable number, because it can be changed into a prime (21283243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37187 + ... + 37754.

It is an arithmetic number, because the mean of its divisors is an integer number (3147564).

Almost surely, 2^21283244 is an apocalyptic number.

It is an amenable number.

21283244 is a deficient number, since it is larger than the sum of its proper divisors (16487524).

21283244 is a wasteful number, since it uses less digits than its factorization.

21283244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75016 (or 75014 counting only the distinct ones).

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

The square root of 21283244 is about 4613.3766375617. The cubic root of 21283244 is about 277.1272771103.

The spelling of 21283244 in words is "twenty-one million, two hundred eighty-three thousand, two hundred forty-four".