12021200121 has 32 divisors (see below), whose sum is σ = 18429902848. Its totient is φ = 6827405760.

The previous prime is 12021200111. The next prime is 12021200161. The reversal of 12021200121 is 12100212021.

It is not a de Polignac number, because 12021200121 - 2³⁰ = 10947458297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12021200097 and 12021200106.

It is not an unprimeable number, because it can be changed into a prime (12021200111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3543336 + ... + 3546726.

It is an arithmetic number, because the mean of its divisors is an integer number (575934464).

Almost surely, 2^12021200121 is an apocalyptic number.

It is an amenable number.

12021200121 is a deficient number, since it is larger than the sum of its proper divisors (6408702727).

12021200121 is a wasteful number, since it uses less digits than its factorization.

12021200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4381.

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

Adding to 12021200121 its reverse (12100212021), we get a palindrome (24121412142).

The spelling of 12021200121 in words is "twelve billion, twenty-one million, two hundred thousand, one hundred twenty-one".