21244283 has 4 divisors (see below), whose sum is σ = 21352320. Its totient is φ = 21136248.

The previous prime is 21244277. The next prime is 21244291. The reversal of 21244283 is 38244212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21244283 - 2⁶ = 21244219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21244213) 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, 53723 + ... + 54116.

It is an arithmetic number, because the mean of its divisors is an integer number (5338080).

Almost surely, 2^21244283 is an apocalyptic number.

21244283 is a deficient number, since it is larger than the sum of its proper divisors (108037).

21244283 is a wasteful number, since it uses less digits than its factorization.

21244283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108036.

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

The square root of 21244283 is about 4609.1520912202. The cubic root of 21244283 is about 276.9580712167.

Adding to 21244283 its reverse (38244212), we get a palindrome (59488495).

The spelling of 21244283 in words is "twenty-one million, two hundred forty-four thousand, two hundred eighty-three".