201311121001 has 4 divisors (see below), whose sum is σ = 202662202500. Its totient is φ = 199960039504.

The previous prime is 201311120929. The next prime is 201311121007. The reversal of 201311121001 is 100121113102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38659424400 + 162651696601 = 196620^2 + 403301^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201311121001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201311121007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 675540526 + ... + 675540823.

It is an arithmetic number, because the mean of its divisors is an integer number (50665550625).

Almost surely, 2^201311121001 is an apocalyptic number.

It is an amenable number.

201311121001 is a deficient number, since it is larger than the sum of its proper divisors (1351081499).

201311121001 is a wasteful number, since it uses less digits than its factorization.

201311121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351081498.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 201311121001 its reverse (100121113102), we get a palindrome (301432234103).

The spelling of 201311121001 in words is "two hundred one billion, three hundred eleven million, one hundred twenty-one thousand, one".