13121220210611 has 4 divisors (see below), whose sum is σ = 13204794861792. Its totient is φ = 13037645559432.

The previous prime is 13121220210577. The next prime is 13121220210613. The reversal of 13121220210611 is 11601202212131.

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

It is a cyclic number.

It is not a de Polignac number, because 13121220210611 - 2⁴² = 8723173699507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13121220210613) 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, 41787325355 + ... + 41787325668.

It is an arithmetic number, because the mean of its divisors is an integer number (3301198715448).

Almost surely, 2^{13121220210611} is an apocalyptic number.

13121220210611 is a deficient number, since it is larger than the sum of its proper divisors (83574651181).

13121220210611 is an equidigital number, since it uses as much as digits as its factorization.

13121220210611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83574651180.

The product of its (nonzero) digits is 288, while the sum is 23.

Adding to 13121220210611 its reverse (11601202212131), we get a palindrome (24722422422742).

The spelling of 13121220210611 in words is "thirteen trillion, one hundred twenty-one billion, two hundred twenty million, two hundred ten thousand, six hundred eleven".