201211111001 has 8 divisors (see below), whose sum is σ = 202542469920. Its totient is φ = 199882055488.

The previous prime is 201211110953. The next prime is 201211111007. The reversal of 201211111001 is 100111112102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201211111001 is a prime.

It is a super-2 number, since 2×201211111001² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (201211111007) 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, 400391 + ... + 750156.

It is an arithmetic number, because the mean of its divisors is an integer number (25317808740).

Almost surely, 2^201211111001 is an apocalyptic number.

It is an amenable number.

201211111001 is a deficient number, since it is larger than the sum of its proper divisors (1331358919).

201211111001 is a wasteful number, since it uses less digits than its factorization.

201211111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151703.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 201211111001 its reverse (100111112102), we get a palindrome (301322223103).

The spelling of 201211111001 in words is "two hundred one billion, two hundred eleven million, one hundred eleven thousand, one".