12021200120121 has 16 divisors (see below), whose sum is σ = 16292838369024. Its totient is φ = 7882698355664.

The previous prime is 12021200120081. The next prime is 12021200120123. The reversal of 12021200120121 is 12102100212021.

It is a cyclic number.

It is not a de Polignac number, because 12021200120121 - 2¹³ = 12021200111929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12021200120121.

It is not an unprimeable number, because it can be changed into a prime (12021200120123) 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, 106282491 + ... + 106395536.

It is an arithmetic number, because the mean of its divisors is an integer number (1018302398064).

Almost surely, 2^{12021200120121} is an apocalyptic number.

It is an amenable number.

12021200120121 is a deficient number, since it is larger than the sum of its proper divisors (4271638248903).

12021200120121 is a wasteful number, since it uses less digits than its factorization.

12021200120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212678340.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12021200120121 its reverse (12102100212021), we get a palindrome (24123300332142).

The spelling of 12021200120121 in words is "twelve trillion, twenty-one billion, two hundred million, one hundred twenty thousand, one hundred twenty-one".