12021021221121 has 24 divisors (see below), whose sum is σ = 19201697669856. Its totient is φ = 7185666479040.

The previous prime is 12021021221081. The next prime is 12021021221161. The reversal of 12021021221121 is 12112212012021.

12021021221121 is a `hidden beast` number, since 12 + 0 + 210 + 212 + 211 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (12021021221081) and next prime (12021021221161).

It is not a de Polignac number, because 12021021221121 - 2⁹ = 12021021220609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12021021221094 and 12021021221103.

It is not an unprimeable number, because it can be changed into a prime (12021021221161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 831667135 + ... + 831681588.

It is an arithmetic number, because the mean of its divisors is an integer number (800070736244).

Almost surely, 2^{12021021221121} is an apocalyptic number.

12021021221121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12021021221121 is a deficient number, since it is larger than the sum of its proper divisors (7180676448735).

12021021221121 is a wasteful number, since it uses less digits than its factorization.

12021021221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663348813 (or 1663348810 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12021021221121 its reverse (12112212012021), we get a palindrome (24133233233142).

The spelling of 12021021221121 in words is "twelve trillion, twenty-one billion, twenty-one million, two hundred twenty-one thousand, one hundred twenty-one".