201020019969991 has 2 divisors, whose sum is σ = 201020019969992. Its totient is φ = 201020019969990.

The previous prime is 201020019969929. The next prime is 201020019970013. The reversal of 201020019969991 is 199969910020102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201020019969991 is a prime.

It is a super-3 number, since 3×201020019969991³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201020019961991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510009984995 + 100510009984996.

It is an arithmetic number, because the mean of its divisors is an integer number (100510009984996).

Almost surely, 2^{201020019969991} is an apocalyptic number.

201020019969991 is a deficient number, since it is larger than the sum of its proper divisors (1).

201020019969991 is an equidigital number, since it uses as much as digits as its factorization.

201020019969991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1417176, while the sum is 58.

The spelling of 201020019969991 in words is "two hundred one trillion, twenty billion, nineteen million, nine hundred sixty-nine thousand, nine hundred ninety-one".