21322222 has 4 divisors (see below), whose sum is σ = 31983336. Its totient is φ = 10661110.

The previous prime is 21322207. The next prime is 21322229. The reversal of 21322222 is 22222312.

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

21322222 is a modest number, since divided by 2222 gives 2132 as remainder.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 21322196 and 21322205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330554 + ... + 5330557.

It is an arithmetic number, because the mean of its divisors is an integer number (7995834).

Almost surely, 2^21322222 is an apocalyptic number.

21322222 is a deficient number, since it is larger than the sum of its proper divisors (10661114).

21322222 is a wasteful number, since it uses less digits than its factorization.

21322222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10661113.

The product of its digits is 192, while the sum is 16.

The square root of 21322222 is about 4617.5991597366. The cubic root of 21322222 is about 277.2963503266.

Adding to 21322222 its reverse (22222312), we get a palindrome (43544534).

The spelling of 21322222 in words is "twenty-one million, three hundred twenty-two thousand, two hundred twenty-two".