21221033222 has 4 divisors (see below), whose sum is σ = 31831549836. Its totient is φ = 10610516610.

The previous prime is 21221033221. The next prime is 21221033227. The reversal of 21221033222 is 22233012212.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21221033194 and 21221033203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221033221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305258304 + ... + 5305258307.

It is an arithmetic number, because the mean of its divisors is an integer number (7957887459).

Almost surely, 2^21221033222 is an apocalyptic number.

21221033222 is a deficient number, since it is larger than the sum of its proper divisors (10610516614).

21221033222 is a wasteful number, since it uses less digits than its factorization.

21221033222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10610516613.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21221033222 its reverse (22233012212), we get a palindrome (43454045434).

The spelling of 21221033222 in words is "twenty-one billion, two hundred twenty-one million, thirty-three thousand, two hundred twenty-two".