12020021220121 has 32 divisors (see below), whose sum is σ = 12744096768000. Its totient is φ = 11318364997632.

The previous prime is 12020021220083. The next prime is 12020021220211. The reversal of 12020021220121 is 12102212002021.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12020021220121 - 2¹³ = 12020021211929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12020021220095 and 12020021220104.

It is not an unprimeable number, because it can be changed into a prime (12020021221121) 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, 1796979945 + ... + 1796986633.

It is an arithmetic number, because the mean of its divisors is an integer number (398253024000).

Almost surely, 2^{12020021220121} is an apocalyptic number.

It is an amenable number.

12020021220121 is a deficient number, since it is larger than the sum of its proper divisors (724075547879).

12020021220121 is a wasteful number, since it uses less digits than its factorization.

12020021220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11241.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12020021220121 its reverse (12102212002021), we get a palindrome (24122233222142).

The spelling of 12020021220121 in words is "twelve trillion, twenty billion, twenty-one million, two hundred twenty thousand, one hundred twenty-one".