201020202112123 has 4 divisors (see below), whose sum is σ = 204427324181880. Its totient is φ = 197613080042368.

The previous prime is 201020202112043. The next prime is 201020202112127. The reversal of 201020202112123 is 321211202020102.

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 201020202112123 - 2⁹ = 201020202111611 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201020202112123.

It is not an unprimeable number, because it can be changed into a prime (201020202112127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1703561034790 + ... + 1703561034907.

It is an arithmetic number, because the mean of its divisors is an integer number (51106831045470).

Almost surely, 2^{201020202112123} is an apocalyptic number.

201020202112123 is a deficient number, since it is larger than the sum of its proper divisors (3407122069757).

201020202112123 is an equidigital number, since it uses as much as digits as its factorization.

201020202112123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3407122069756.

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

Adding to 201020202112123 its reverse (321211202020102), we get a palindrome (522231404132225).

The spelling of 201020202112123 in words is "two hundred one trillion, twenty billion, two hundred two million, one hundred twelve thousand, one hundred twenty-three".