12021230220121 has 8 divisors (see below), whose sum is σ = 12186343551240. Its totient is φ = 11856128752512.

The previous prime is 12021230220053. The next prime is 12021230220149. The reversal of 12021230220121 is 12102203212021.

It can be written as a sum of positive squares in 4 ways, for example, as 5667427764496 + 6353802455625 = 2380636^2 + 2520675^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12021230220121 - 2³⁹ = 11471474406233 is a prime.

It is a super-2 number, since 2×12021230220121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021230220161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 915706 + ... + 4988083.

It is an arithmetic number, because the mean of its divisors is an integer number (1523292943905).

Almost surely, 2^{12021230220121} is an apocalyptic number.

It is an amenable number.

12021230220121 is a deficient number, since it is larger than the sum of its proper divisors (165113331119).

12021230220121 is an equidigital number, since it uses as much as digits as its factorization.

12021230220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5931755.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 12021230220121 its reverse (12102203212021), we get a palindrome (24123433432142).

The spelling of 12021230220121 in words is "twelve trillion, twenty-one billion, two hundred thirty million, two hundred twenty thousand, one hundred twenty-one".