13121231011 has 4 divisors (see below), whose sum is σ = 14995692592. Its totient is φ = 11246769432.

The previous prime is 13121231003. The next prime is 13121231017. The reversal of 13121231011 is 11013212131.

It is a happy number.

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 13121231011 - 2³ = 13121231003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13121231017) 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, 937230780 + ... + 937230793.

It is an arithmetic number, because the mean of its divisors is an integer number (3748923148).

Almost surely, 2^13121231011 is an apocalyptic number.

13121231011 is a deficient number, since it is larger than the sum of its proper divisors (1874461581).

13121231011 is an equidigital number, since it uses as much as digits as its factorization.

13121231011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1874461580.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 13121231011 its reverse (11013212131), we get a palindrome (24134443142).

The spelling of 13121231011 in words is "thirteen billion, one hundred twenty-one million, two hundred thirty-one thousand, eleven".