2121201111013 has 4 divisors (see below), whose sum is σ = 2194345976940. Its totient is φ = 2048056245088.

The previous prime is 2121201110981. The next prime is 2121201111017. The reversal of 2121201111013 is 3101111021212.

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 822690722529 + 1298510388484 = 907023^2 + 1139522^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121201111013 - 2⁵ = 2121201110981 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 (2121201111017) 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, 36572432920 + ... + 36572432977.

It is an arithmetic number, because the mean of its divisors is an integer number (548586494235).

Almost surely, 2^{2121201111013} is an apocalyptic number.

It is an amenable number.

2121201111013 is a deficient number, since it is larger than the sum of its proper divisors (73144865927).

2121201111013 is an equidigital number, since it uses as much as digits as its factorization.

2121201111013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73144865926.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 2121201111013 its reverse (3101111021212), we get a palindrome (5222312132225).

The spelling of 2121201111013 in words is "two trillion, one hundred twenty-one billion, two hundred one million, one hundred eleven thousand, thirteen".