21222363 has 4 divisors (see below), whose sum is σ = 28296488. Its totient is φ = 14148240.

The previous prime is 21222361. The next prime is 21222367. The reversal of 21222363 is 36322212.

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

It is not a de Polignac number, because 21222363 - 2¹ = 21222361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222361) 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, 3537058 + ... + 3537063.

It is an arithmetic number, because the mean of its divisors is an integer number (7074122).

Almost surely, 2^21222363 is an apocalyptic number.

21222363 is a deficient number, since it is larger than the sum of its proper divisors (7074125).

21222363 is an equidigital number, since it uses as much as digits as its factorization.

21222363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7074124.

The product of its digits is 864, while the sum is 21.

The square root of 21222363 is about 4606.7735998202. The cubic root of 21222363 is about 276.8627826768.

Adding to 21222363 its reverse (36322212), we get a palindrome (57544575).

The spelling of 21222363 in words is "twenty-one million, two hundred twenty-two thousand, three hundred sixty-three".