201211103121013 has 4 divisors (see below), whose sum is σ = 201211204786380. Its totient is φ = 201211001455648.

The previous prime is 201211103120999. The next prime is 201211103121031. The reversal of 201211103121013 is 310121301112102.

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 154014230601009 + 47196872520004 = 12410247^2 + 6869998^2 .

It is a cyclic number.

It is not a de Polignac number, because 201211103121013 - 2¹³ = 201211103112821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211103121043) 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, 47803798 + ... + 51842311.

It is an arithmetic number, because the mean of its divisors is an integer number (50302801196595).

Almost surely, 2^{201211103121013} is an apocalyptic number.

It is an amenable number.

201211103121013 is a deficient number, since it is larger than the sum of its proper divisors (101665367).

201211103121013 is an equidigital number, since it uses as much as digits as its factorization.

201211103121013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101665366.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 201211103121013 its reverse (310121301112102), we get a palindrome (511332404233115).

The spelling of 201211103121013 in words is "two hundred one trillion, two hundred eleven billion, one hundred three million, one hundred twenty-one thousand, thirteen".