211212212122 has 4 divisors (see below), whose sum is σ = 316818318186. Its totient is φ = 105606106060.

The previous prime is 211212212089. The next prime is 211212212131. The reversal of 211212212122 is 221212212112.

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., 187410202281 + 23802009841 = 432909^2 + 154279^2 .

It is a super-2 number, since 2×211212212122² (a number of 23 digits) contains 22 as substring.

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 211212212122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52803053029 + ... + 52803053032.

Almost surely, 2^211212212122 is an apocalyptic number.

211212212122 is a deficient number, since it is larger than the sum of its proper divisors (105606106064).

211212212122 is a wasteful number, since it uses less digits than its factorization.

211212212122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105606106063.

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

Adding to 211212212122 its reverse (221212212112), we get a palindrome (432424424234).

The spelling of 211212212122 in words is "two hundred eleven billion, two hundred twelve million, two hundred twelve thousand, one hundred twenty-two".