201221200231 has 2 divisors, whose sum is σ = 201221200232. Its totient is φ = 201221200230.

The previous prime is 201221200217. The next prime is 201221200237. The reversal of 201221200231 is 132002122102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201221200231 - 2²⁹ = 200684329319 is a prime.

It is a super-2 number, since 2×201221200231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201221200237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610600115 + 100610600116.

It is an arithmetic number, because the mean of its divisors is an integer number (100610600116).

Almost surely, 2^201221200231 is an apocalyptic number.

201221200231 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221200231 is an equidigital number, since it uses as much as digits as its factorization.

201221200231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 201221200231 its reverse (132002122102), we get a palindrome (333223322333).

The spelling of 201221200231 in words is "two hundred one billion, two hundred twenty-one million, two hundred thousand, two hundred thirty-one".