2021201220121 has 8 divisors (see below), whose sum is σ = 2022401309544. Its totient is φ = 2020001464320.

The previous prime is 2021201220097. The next prime is 2021201220127. The reversal of 2021201220121 is 1210221021202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 158006250000 + 1863194970121 = 397500^2 + 1364989^2 .

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 2021201220121 - 2¹¹ = 2021201218073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021201220095 and 2021201220104.

It is not an unprimeable number, because it can be changed into a prime (2021201220127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12603481 + ... + 12762841.

It is an arithmetic number, because the mean of its divisors is an integer number (252800163693).

Almost surely, 2^{2021201220121} is an apocalyptic number.

It is an amenable number.

2021201220121 is a deficient number, since it is larger than the sum of its proper divisors (1200089423).

2021201220121 is a wasteful number, since it uses less digits than its factorization.

2021201220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166811.

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

Adding to 2021201220121 its reverse (1210221021202), we get a palindrome (3231422241323).

It can be divided in two parts, 202120 and 1220121, that added together give a palindrome (1422241).

The spelling of 2021201220121 in words is "two trillion, twenty-one billion, two hundred one million, two hundred twenty thousand, one hundred twenty-one".