12120020121 has 16 divisors (see below), whose sum is σ = 18197803008. Its totient is φ = 7108515600.

The previous prime is 12120020113. The next prime is 12120020123. The reversal of 12120020121 is 12102002121.

It is not a de Polignac number, because 12120020121 - 2³ = 12120020113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12120020097 and 12120020106.

It is not an unprimeable number, because it can be changed into a prime (12120020123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5922741 + ... + 5924786.

It is an arithmetic number, because the mean of its divisors is an integer number (1137362688).

Almost surely, 2^12120020121 is an apocalyptic number.

12120020121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12120020121 is a deficient number, since it is larger than the sum of its proper divisors (6077782887).

12120020121 is a wasteful number, since it uses less digits than its factorization.

12120020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11847572.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12120020121 its reverse (12102002121), we get a palindrome (24222022242).

The spelling of 12120020121 in words is "twelve billion, one hundred twenty million, twenty thousand, one hundred twenty-one".