201321129109 has 2 divisors, whose sum is σ = 201321129110. Its totient is φ = 201321129108.

The previous prime is 201321129083. The next prime is 201321129127. The reversal of 201321129109 is 901921123102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188794595025 + 12526534084 = 434505^2 + 111922^2 .

It is a cyclic number.

It is not a de Polignac number, because 201321129109 - 2⁹ = 201321128597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201321129199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100660564554 + 100660564555.

It is an arithmetic number, because the mean of its divisors is an integer number (100660564555).

Almost surely, 2^201321129109 is an apocalyptic number.

It is an amenable number.

201321129109 is a deficient number, since it is larger than the sum of its proper divisors (1).

201321129109 is an equidigital number, since it uses as much as digits as its factorization.

201321129109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The spelling of 201321129109 in words is "two hundred one billion, three hundred twenty-one million, one hundred twenty-nine thousand, one hundred nine".