201231222011 has 4 divisors (see below), whose sum is σ = 201252501024. Its totient is φ = 201209943000.

The previous prime is 201231221969. The next prime is 201231222043. The reversal of 201231222011 is 110222132102.

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 201231222011 - 2¹⁴ = 201231205627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201231222911) 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, 10625315 + ... + 10644236.

It is an arithmetic number, because the mean of its divisors is an integer number (50313125256).

Almost surely, 2^201231222011 is an apocalyptic number.

201231222011 is a deficient number, since it is larger than the sum of its proper divisors (21279013).

201231222011 is an equidigital number, since it uses as much as digits as its factorization.

201231222011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21279012.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 201231222011 its reverse (110222132102), we get a palindrome (311453354113).

The spelling of 201231222011 in words is "two hundred one billion, two hundred thirty-one million, two hundred twenty-two thousand, eleven".