12121120121 has 4 divisors (see below), whose sum is σ = 13223040144. Its totient is φ = 11019200100.

The previous prime is 12121120009. The next prime is 12121120127. The reversal of 12121120121 is 12102112121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12121120121 - 2¹⁸ = 12120857977 is a prime.

It is a super-2 number, since 2×12121120121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121120096 and 12121120105.

It is not an unprimeable number, because it can be changed into a prime (12121120127) 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, 550959995 + ... + 550960016.

It is an arithmetic number, because the mean of its divisors is an integer number (3305760036).

Almost surely, 2^12121120121 is an apocalyptic number.

12121120121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12121120121 is a deficient number, since it is larger than the sum of its proper divisors (1101920023).

12121120121 is a wasteful number, since it uses less digits than its factorization.

12121120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101920022.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12121120121 its reverse (12102112121), we get a palindrome (24223232242).

The spelling of 12121120121 in words is "twelve billion, one hundred twenty-one million, one hundred twenty thousand, one hundred twenty-one".