12021221122 has 4 divisors (see below), whose sum is σ = 18031831686. Its totient is φ = 6010610560.

The previous prime is 12021221117. The next prime is 12021221171. The reversal of 12021221122 is 22112212021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22112212021 = 9007 ⋅2455003.

It can be written as a sum of positive squares in only one way, i.e., 8860645161 + 3160575961 = 94131^2 + 56219^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12021221096 and 12021221105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3005305279 + ... + 3005305282.

Almost surely, 2^12021221122 is an apocalyptic number.

12021221122 is a deficient number, since it is larger than the sum of its proper divisors (6010610564).

12021221122 is an equidigital number, since it uses as much as digits as its factorization.

12021221122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6010610563.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12021221122 its reverse (22112212021), we get a palindrome (34133433143).

The spelling of 12021221122 in words is "twelve billion, twenty-one million, two hundred twenty-one thousand, one hundred twenty-two".