201211001999 has 8 divisors (see below), whose sum is σ = 230103515040. Its totient is φ = 172355510016.

The previous prime is 201211001989. The next prime is 201211002007. The reversal of 201211001999 is 999100112102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201211001999 - 2²⁰ = 201209953423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211001939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9243614 + ... + 9265355.

It is an arithmetic number, because the mean of its divisors is an integer number (28762939380).

Almost surely, 2^201211001999 is an apocalyptic number.

201211001999 is a deficient number, since it is larger than the sum of its proper divisors (28892513041).

201211001999 is a wasteful number, since it uses less digits than its factorization.

201211001999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18510529.

The product of its (nonzero) digits is 2916, while the sum is 35.

The spelling of 201211001999 in words is "two hundred one billion, two hundred eleven million, one thousand, nine hundred ninety-nine".