201211042123 has 16 divisors (see below), whose sum is σ = 253403535616. Its totient is φ = 155497618080.

The previous prime is 201211042111. The next prime is 201211042127. The reversal of 201211042123 is 321240112102.

It is not a de Polignac number, because 201211042123 - 2²¹ = 201208944971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201211042123.

It is not an unprimeable number, because it can be changed into a prime (201211042127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25706673 + ... + 25714498.

It is an arithmetic number, because the mean of its divisors is an integer number (15837720976).

Almost surely, 2^201211042123 is an apocalyptic number.

201211042123 is a deficient number, since it is larger than the sum of its proper divisors (52192493493).

201211042123 is a wasteful number, since it uses less digits than its factorization.

201211042123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51421234.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 201211042123 its reverse (321240112102), we get a palindrome (522451154225).

The spelling of 201211042123 in words is "two hundred one billion, two hundred eleven million, forty-two thousand, one hundred twenty-three".