12121111020109 has 128 divisors (see below), whose sum is σ = 15972851220480. Its totient is φ = 8940618086400.

The previous prime is 12121111020091. The next prime is 12121111020113. The reversal of 12121111020109 is 90102011112121.

It is a happy number.

It is not a de Polignac number, because 12121111020109 - 2⁷ = 12121111019981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12121111020109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121111020199) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6562593024 + ... + 6562594870.

It is an arithmetic number, because the mean of its divisors is an integer number (124787900160).

Almost surely, 2^{12121111020109} is an apocalyptic number.

It is an amenable number.

12121111020109 is a deficient number, since it is larger than the sum of its proper divisors (3851740200371).

12121111020109 is a wasteful number, since it uses less digits than its factorization.

12121111020109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2531.

The product of its (nonzero) digits is 72, while the sum is 22.

The spelling of 12121111020109 in words is "twelve trillion, one hundred twenty-one billion, one hundred eleven million, twenty thousand, one hundred nine".