2112122121211 has 4 divisors (see below), whose sum is σ = 2223286443400. Its totient is φ = 2000957799024.

The previous prime is 2112122121077. The next prime is 2112122121233. The reversal of 2112122121211 is 1121212212112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2112122121211 - 2³⁷ = 1974683167739 is a prime.

It is a super-2 number, since 2×2112122121211² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 111164322169 = 2112122121211 / (2 + 1 + 1 + 2 + 1 + 2 + 2 + 1 + 2 + 1 + 2 + 1 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2112122121251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55582161066 + ... + 55582161103.

It is an arithmetic number, because the mean of its divisors is an integer number (555821610850).

Almost surely, 2^{2112122121211} is an apocalyptic number.

2112122121211 is a deficient number, since it is larger than the sum of its proper divisors (111164322189).

2112122121211 is a wasteful number, since it uses less digits than its factorization.

2112122121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111164322188.

The product of its digits is 64, while the sum is 19.

Adding to 2112122121211 its reverse (1121212212112), we get a palindrome (3233334333323).

Subtracting from 2112122121211 its reverse (1121212212112), we obtain a palindrome (990909909099).

The spelling of 2112122121211 in words is "two trillion, one hundred twelve billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred eleven".