1211201111201 has 4 divisors (see below), whose sum is σ = 1219914788400. Its totient is φ = 1202487434004.

The previous prime is 1211201111147. The next prime is 1211201111243. The reversal of 1211201111201 is 1021111021121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211201111201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211201111261) 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, 4356838391 + ... + 4356838668.

It is an arithmetic number, because the mean of its divisors is an integer number (304978697100).

Almost surely, 2^{1211201111201} is an apocalyptic number.

It is an amenable number.

1211201111201 is a deficient number, since it is larger than the sum of its proper divisors (8713677199).

1211201111201 is an equidigital number, since it uses as much as digits as its factorization.

1211201111201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8713677198.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1211201111201 its reverse (1021111021121), we get a palindrome (2232312132322).

It can be divided in two parts, 121120 and 1111201, that added together give a palindrome (1232321).

The spelling of 1211201111201 in words is "one trillion, two hundred eleven billion, two hundred one million, one hundred eleven thousand, two hundred one".