201211221331123 has 4 divisors (see below), whose sum is σ = 201279359234968. Its totient is φ = 201143083427280.

The previous prime is 201211221331117. The next prime is 201211221331129. The reversal of 201211221331123 is 321133122112102.

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

It is an interprime number because it is at equal distance from previous prime (201211221331117) and next prime (201211221331129).

It is a cyclic number.

It is not a de Polignac number, because 201211221331123 - 2⁹ = 201211221330611 is a prime.

It is a super-2 number, since 2×201211221331123² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201211221331129) 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 3 ways as a sum of consecutive naturals, for example, 34068947493 + ... + 34068953398.

It is an arithmetic number, because the mean of its divisors is an integer number (50319839808742).

Almost surely, 2^{201211221331123} is an apocalyptic number.

201211221331123 is a deficient number, since it is larger than the sum of its proper divisors (68137903845).

201211221331123 is an equidigital number, since it uses as much as digits as its factorization.

201211221331123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68137903844.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 201211221331123 its reverse (321133122112102), we get a palindrome (522344343443225).

The spelling of 201211221331123 in words is "two hundred one trillion, two hundred eleven billion, two hundred twenty-one million, three hundred thirty-one thousand, one hundred twenty-three".