212123122011 has 12 divisors (see below), whose sum is σ = 306509491080. Its totient is φ = 141364910400.

The previous prime is 212123122009. The next prime is 212123122039. The reversal of 212123122011 is 110221321212.

212123122011 is a `hidden beast` number, since 212 + 1 + 231 + 220 + 1 + 1 = 666.

It is not a de Polignac number, because 212123122011 - 2¹ = 212123122009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212123124011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4182081 + ... + 4232498.

It is an arithmetic number, because the mean of its divisors is an integer number (25542457590).

Almost surely, 2^212123122011 is an apocalyptic number.

212123122011 is a deficient number, since it is larger than the sum of its proper divisors (94386369069).

212123122011 is a wasteful number, since it uses less digits than its factorization.

212123122011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8417386 (or 8417383 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 212123122011 its reverse (110221321212), we get a palindrome (322344443223).

The spelling of 212123122011 in words is "two hundred twelve billion, one hundred twenty-three million, one hundred twenty-two thousand, eleven".