13121112221011 has 4 divisors (see below), whose sum is σ = 13133455695472. Its totient is φ = 13108768746552.

The previous prime is 13121112220969. The next prime is 13121112221023. The reversal of 13121112221011 is 11012221112131.

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 13121112221011 - 2³¹ = 13118964737363 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13121112221011.

It is not an unprimeable number, because it can be changed into a prime (13121112201011) 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, 6171735636 + ... + 6171737761.

It is an arithmetic number, because the mean of its divisors is an integer number (3283363923868).

Almost surely, 2^{13121112221011} is an apocalyptic number.

13121112221011 is a deficient number, since it is larger than the sum of its proper divisors (12343474461).

13121112221011 is a wasteful number, since it uses less digits than its factorization.

13121112221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12343474460.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 13121112221011 its reverse (11012221112131), we get a palindrome (24133333333142).

The spelling of 13121112221011 in words is "thirteen trillion, one hundred twenty-one billion, one hundred twelve million, two hundred twenty-one thousand, eleven".