13120121111 has 4 divisors (see below), whose sum is σ = 13399272672. Its totient is φ = 12840969552.

The previous prime is 13120121107. The next prime is 13120121123. The reversal of 13120121111 is 11112102131.

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 13120121111 - 2² = 13120121107 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 (13120121141) 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, 139575710 + ... + 139575803.

It is an arithmetic number, because the mean of its divisors is an integer number (3349818168).

Almost surely, 2^13120121111 is an apocalyptic number.

13120121111 is a deficient number, since it is larger than the sum of its proper divisors (279151561).

13120121111 is an equidigital number, since it uses as much as digits as its factorization.

13120121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279151560.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 13120121111 its reverse (11112102131), we get a palindrome (24232223242).

The spelling of 13120121111 in words is "thirteen billion, one hundred twenty million, one hundred twenty-one thousand, one hundred eleven".