12111010121 has 16 divisors (see below), whose sum is σ = 13909296000. Its totient is φ = 10329845760.

The previous prime is 12111010057. The next prime is 12111010139. The reversal of 12111010121 is 12101011121.

It is a cyclic number.

It is not a de Polignac number, because 12111010121 - 2⁶ = 12111010057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12111010141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2103755 + ... + 2109503.

It is an arithmetic number, because the mean of its divisors is an integer number (869331000).

Almost surely, 2^12111010121 is an apocalyptic number.

It is an amenable number.

12111010121 is a deficient number, since it is larger than the sum of its proper divisors (1798285879).

12111010121 is a wasteful number, since it uses less digits than its factorization.

12111010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7184.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 12111010121 its reverse (12101011121), we get a palindrome (24212021242).

The spelling of 12111010121 in words is "twelve billion, one hundred eleven million, ten thousand, one hundred twenty-one".