21222122220122 has 4 divisors (see below), whose sum is σ = 31833183330186. Its totient is φ = 10611061110060.

The previous prime is 21222122220119. The next prime is 21222122220161. The reversal of 21222122220122 is 22102222122212.

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

It can be written as a sum of positive squares in only one way, i.e., 20772255560281 + 449866659841 = 4557659^2 + 670721^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305530555029 + ... + 5305530555032.

Almost surely, 2^{21222122220122} is an apocalyptic number.

21222122220122 is a deficient number, since it is larger than the sum of its proper divisors (10611061110064).

21222122220122 is a wasteful number, since it uses less digits than its factorization.

21222122220122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10611061110063.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21222122220122 its reverse (22102222122212), we get a palindrome (43324344342334).

The spelling of 21222122220122 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-two million, two hundred twenty thousand, one hundred twenty-two".