201372809921 has 2 divisors, whose sum is σ = 201372809922. Its totient is φ = 201372809920.

The previous prime is 201372809867. The next prime is 201372809959. The reversal of 201372809921 is 129908273102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158798265025 + 42574544896 = 398495^2 + 206336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201372809921 is a prime.

It is not a weakly prime, because it can be changed into another prime (201372802921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100686404960 + 100686404961.

It is an arithmetic number, because the mean of its divisors is an integer number (100686404961).

Almost surely, 2^201372809921 is an apocalyptic number.

It is an amenable number.

201372809921 is a deficient number, since it is larger than the sum of its proper divisors (1).

201372809921 is an equidigital number, since it uses as much as digits as its factorization.

201372809921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 201372809921 in words is "two hundred one billion, three hundred seventy-two million, eight hundred nine thousand, nine hundred twenty-one".