21212122211122 has 8 divisors (see below), whose sum is σ = 31820094253872. Its totient is φ = 10605424126500.

The previous prime is 21212122211117. The next prime is 21212122211129. The reversal of 21212122211122 is 22111222121212.

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

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21212122211093 and 21212122211102.

It is not an unprimeable number, because it can be changed into a prime (21212122211129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318447904 + ... + 318514507.

It is an arithmetic number, because the mean of its divisors is an integer number (3977511781734).

Almost surely, 2^{21212122211122} is an apocalyptic number.

21212122211122 is a deficient number, since it is larger than the sum of its proper divisors (10607972042750).

21212122211122 is a wasteful number, since it uses less digits than its factorization.

21212122211122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636979064.

The product of its digits is 256, while the sum is 22.

Adding to 21212122211122 its reverse (22111222121212), we get a palindrome (43323344332334).

It can be divided in two parts, 2121212 and 2211122, that added together give a palindrome (4332334).

The spelling of 21212122211122 in words is "twenty-one trillion, two hundred twelve billion, one hundred twenty-two million, two hundred eleven thousand, one hundred twenty-two".