12002020121 has 32 divisors (see below), whose sum is σ = 15159809280. Its totient is φ = 9247924224.

The previous prime is 12002020097. The next prime is 12002020123. The reversal of 12002020121 is 12102020021.

It is a happy number.

It is not a de Polignac number, because 12002020121 - 2¹⁴ = 12002003737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12002020123) 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, 1376945 + ... + 1385633.

It is an arithmetic number, because the mean of its divisors is an integer number (473744040).

Almost surely, 2^12002020121 is an apocalyptic number.

It is an amenable number.

12002020121 is a deficient number, since it is larger than the sum of its proper divisors (3157789159).

12002020121 is a wasteful number, since it uses less digits than its factorization.

12002020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9105.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12002020121 its reverse (12102020021), we get a palindrome (24104040142).

The spelling of 12002020121 in words is "twelve billion, two million, twenty thousand, one hundred twenty-one".