212122121122 has 4 divisors (see below), whose sum is σ = 318183181686. Its totient is φ = 106061060560.

The previous prime is 212122121051. The next prime is 212122121143. The reversal of 212122121122 is 221121221212.

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., 157187667961 + 54934453161 = 396469^2 + 234381^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 212122121122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53030530279 + ... + 53030530282.

Almost surely, 2^212122121122 is an apocalyptic number.

212122121122 is a deficient number, since it is larger than the sum of its proper divisors (106061060564).

212122121122 is a wasteful number, since it uses less digits than its factorization.

212122121122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106061060563.

The product of its digits is 128, while the sum is 19.

Adding to 212122121122 its reverse (221121221212), we get a palindrome (433243342334).

The spelling of 212122121122 in words is "two hundred twelve billion, one hundred twenty-two million, one hundred twenty-one thousand, one hundred twenty-two".