201221102312231 has 4 divisors (see below), whose sum is σ = 201221390310864. Its totient is φ = 201220814313600.

The previous prime is 201221102312203. The next prime is 201221102312273. The reversal of 201221102312231 is 132213201122102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201221102312231 is a prime.

It is a super-3 number, since 3×201221102312231³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201221102312197 and 201221102312206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221102312291) 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, 142948730 + ... + 144349511.

It is an arithmetic number, because the mean of its divisors is an integer number (50305347577716).

Almost surely, 2^{201221102312231} is an apocalyptic number.

201221102312231 is a deficient number, since it is larger than the sum of its proper divisors (287998633).

201221102312231 is an equidigital number, since it uses as much as digits as its factorization.

201221102312231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287998632.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 201221102312231 its reverse (132213201122102), we get a palindrome (333434303434333).

The spelling of 201221102312231 in words is "two hundred one trillion, two hundred twenty-one billion, one hundred two million, three hundred twelve thousand, two hundred thirty-one".