201221431 has 2 divisors, whose sum is σ = 201221432. Its totient is φ = 201221430.

The previous prime is 201221417. The next prime is 201221441. The reversal of 201221431 is 134122102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201221431 - 2²¹ = 199124279 is a prime.

It is a super-2 number, since 2×201221431² = 80980128587375522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201221441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610715 + 100610716.

It is an arithmetic number, because the mean of its divisors is an integer number (100610716).

Almost surely, 2^201221431 is an apocalyptic number.

201221431 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221431 is an equidigital number, since it uses as much as digits as its factorization.

201221431 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.

The square root of 201221431 is about 14185.2539984309. The cubic root of 201221431 is about 585.9916276221.

Adding to 201221431 its reverse (134122102), we get a palindrome (335343533).

The spelling of 201221431 in words is "two hundred one million, two hundred twenty-one thousand, four hundred thirty-one".