201021202212121 has 32 divisors (see below), whose sum is σ = 216580184802432. Its totient is φ = 185884254120960.

The previous prime is 201021202212071. The next prime is 201021202212133. The reversal of 201021202212121 is 121212202120102.

It is a cyclic number.

It is not a de Polignac number, because 201021202212121 - 2¹⁹ = 201021201687833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201021202212221) 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, 4242093390 + ... + 4242140776.

It is an arithmetic number, because the mean of its divisors is an integer number (6768130775076).

Almost surely, 2^{201021202212121} is an apocalyptic number.

It is an amenable number.

201021202212121 is a deficient number, since it is larger than the sum of its proper divisors (15558982590311).

201021202212121 is a wasteful number, since it uses less digits than its factorization.

201021202212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52009.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 201021202212121 its reverse (121212202120102), we get a palindrome (322233404332223).

The spelling of 201021202212121 in words is "two hundred one trillion, twenty-one billion, two hundred two million, two hundred twelve thousand, one hundred twenty-one".