201123321221523 has 4 divisors (see below), whose sum is σ = 268164428295368. Its totient is φ = 134082214147680.

The previous prime is 201123321221461. The next prime is 201123321221527. The reversal of 201123321221523 is 325122123321102.

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

It is not a de Polignac number, because 201123321221523 - 2²⁸ = 201123052786067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201123321221527) 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, 33520553536918 + ... + 33520553536923.

It is an arithmetic number, because the mean of its divisors is an integer number (67041107073842).

Almost surely, 2^{201123321221523} is an apocalyptic number.

201123321221523 is a deficient number, since it is larger than the sum of its proper divisors (67041107073845).

201123321221523 is an equidigital number, since it uses as much as digits as its factorization.

201123321221523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67041107073844.

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 201123321221523 its reverse (325122123321102), we get a palindrome (526245444542625).

The spelling of 201123321221523 in words is "two hundred one trillion, one hundred twenty-three billion, three hundred twenty-one million, two hundred twenty-one thousand, five hundred twenty-three".