21023222 has 8 divisors (see below), whose sum is σ = 34401672. Its totient is φ = 9556000.

The previous prime is 21023213. The next prime is 21023257. The reversal of 21023222 is 22232012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21023222² = 883951726522568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21023197 and 21023206.

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, 477779 + ... + 477822.

It is an arithmetic number, because the mean of its divisors is an integer number (4300209).

Almost surely, 2^21023222 is an apocalyptic number.

21023222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21023222 is a deficient number, since it is larger than the sum of its proper divisors (13378450).

21023222 is a wasteful number, since it uses less digits than its factorization.

21023222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955614.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 21023222 is about 4585.1087228113. The cubic root of 21023222 is about 275.9940749971.

Adding to 21023222 its reverse (22232012), we get a palindrome (43255234).

It can be divided in two parts, 210 and 23222, that added together give a palindrome (23432).

The spelling of 21023222 in words is "twenty-one million, twenty-three thousand, two hundred twenty-two".