21222222022 has 4 divisors (see below), whose sum is σ = 31833333036. Its totient is φ = 10611111010.

The previous prime is 21222222001. The next prime is 21222222031. The reversal of 21222222022 is 22022222212.

21222222022 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

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, 5305555504 + ... + 5305555507.

It is an arithmetic number, because the mean of its divisors is an integer number (7958333259).

Almost surely, 2^21222222022 is an apocalyptic number.

21222222022 is a deficient number, since it is larger than the sum of its proper divisors (10611111014).

21222222022 is a wasteful number, since it uses less digits than its factorization.

21222222022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10611111013.

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 21222222022 its reverse (22022222212), we get a palindrome (43244444234).

The spelling of 21222222022 in words is "twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, twenty-two".