201111202121985 has 20 divisors (see below), whose sum is σ = 360510451211988. Its totient is φ = 107259307798176.

The previous prime is 201111202121941. The next prime is 201111202122007. The reversal of 201111202121985 is 589121202111102.

It is a happy number.

201111202121985 is a `hidden beast` number, since 20 + 111 + 120 + 212 + 198 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 157830803203329 + 43280398918656 = 12563073^2 + 6578784^2 .

It is not a de Polignac number, because 201111202121985 - 2²² = 201111197927681 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 248285434314 + ... + 248285435123.

Almost surely, 2^{201111202121985} is an apocalyptic number.

It is an amenable number.

201111202121985 is a deficient number, since it is larger than the sum of its proper divisors (159399249090003).

201111202121985 is an equidigital number, since it uses as much as digits as its factorization.

201111202121985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496570869454 (or 496570869445 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 36.

The spelling of 201111202121985 in words is "two hundred one trillion, one hundred eleven billion, two hundred two million, one hundred twenty-one thousand, nine hundred eighty-five".