20321201129 has 2 divisors, whose sum is σ = 20321201130. Its totient is φ = 20321201128.

The previous prime is 20321201123. The next prime is 20321201137. The reversal of 20321201129 is 92110212302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14318515600 + 6002685529 = 119660^2 + 77477^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321201129 - 2²⁴ = 20304423913 is a prime.

It is not a weakly prime, because it can be changed into another prime (20321201123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160600564 + 10160600565.

It is an arithmetic number, because the mean of its divisors is an integer number (10160600565).

Almost surely, 2^20321201129 is an apocalyptic number.

It is an amenable number.

20321201129 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321201129 is an equidigital number, since it uses as much as digits as its factorization.

20321201129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 20321201129 in words is "twenty billion, three hundred twenty-one million, two hundred one thousand, one hundred twenty-nine".