12121131111 has 32 divisors (see below), whose sum is σ = 17486979840. Its totient is φ = 7444329984.

The previous prime is 12121131107. The next prime is 12121131133. The reversal of 12121131111 is 11113112121.

It is not a de Polignac number, because 12121131111 - 2² = 12121131107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121131151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 323620 + ... + 359126.

It is an arithmetic number, because the mean of its divisors is an integer number (546468120).

Almost surely, 2^12121131111 is an apocalyptic number.

12121131111 is a deficient number, since it is larger than the sum of its proper divisors (5365848729).

12121131111 is a wasteful number, since it uses less digits than its factorization.

12121131111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35695.

The product of its digits is 12, while the sum is 15.

Adding to 12121131111 its reverse (11113112121), we get a palindrome (23234243232).

The spelling of 12121131111 in words is "twelve billion, one hundred twenty-one million, one hundred thirty-one thousand, one hundred eleven".