201321211331 has 2 divisors, whose sum is σ = 201321211332. Its totient is φ = 201321211330.

The previous prime is 201321211241. The next prime is 201321211337. The reversal of 201321211331 is 133112123102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201321211331 - 2¹⁴ = 201321194947 is a prime.

It is a super-2 number, since 2×201321211331² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201321211337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100660605665 + 100660605666.

It is an arithmetic number, because the mean of its divisors is an integer number (100660605666).

Almost surely, 2^201321211331 is an apocalyptic number.

201321211331 is a deficient number, since it is larger than the sum of its proper divisors (1).

201321211331 is an equidigital number, since it uses as much as digits as its factorization.

201321211331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 201321211331 its reverse (133112123102), we get a palindrome (334433334433).

The spelling of 201321211331 in words is "two hundred one billion, three hundred twenty-one million, two hundred eleven thousand, three hundred thirty-one".