12101112121 has 8 divisors (see below), whose sum is σ = 13830509504. Its totient is φ = 10371881520.

The previous prime is 12101112109. The next prime is 12101112139. The reversal of 12101112121 is 12121110121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12101112121 - 2¹⁷ = 12100981049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12101116121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247891 + ... + 292663.

It is an arithmetic number, because the mean of its divisors is an integer number (1728813688).

Almost surely, 2^12101112121 is an apocalyptic number.

It is an amenable number.

12101112121 is a deficient number, since it is larger than the sum of its proper divisors (1729397383).

12101112121 is an equidigital number, since it uses as much as digits as its factorization.

12101112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83391.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 12101112121 its reverse (12121110121), we get a palindrome (24222222242).

The spelling of 12101112121 in words is "twelve billion, one hundred one million, one hundred twelve thousand, one hundred twenty-one".