201211212123 has 12 divisors (see below), whose sum is σ = 292759867608. Its totient is φ = 133161677280.

The previous prime is 201211212077. The next prime is 201211212157. The reversal of 201211212123 is 321212112102.

It is not a de Polignac number, because 201211212123 - 2¹³ = 201211203931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201211212096 and 201211212105.

It is not an unprimeable number, because it can be changed into a prime (201211212623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81592933 + ... + 81595398.

It is an arithmetic number, because the mean of its divisors is an integer number (24396655634).

Almost surely, 2^201211212123 is an apocalyptic number.

201211212123 is a deficient number, since it is larger than the sum of its proper divisors (91548655485).

201211212123 is a wasteful number, since it uses less digits than its factorization.

201211212123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163188474 (or 163188471 counting only the distinct ones).

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

Adding to 201211212123 its reverse (321212112102), we get a palindrome (522423324225).

The spelling of 201211212123 in words is "two hundred one billion, two hundred eleven million, two hundred twelve thousand, one hundred twenty-three".