201022121 has 4 divisors (see below), whose sum is σ = 203094612. Its totient is φ = 198949632.

The previous prime is 201022103. The next prime is 201022123. The reversal of 201022121 is 121220102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 81360400 + 119661721 = 9020^2 + 10939^2 .

It is a cyclic number.

It is not a de Polignac number, because 201022121 - 2¹⁴ = 201005737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (201022123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1036100 + ... + 1036293.

It is an arithmetic number, because the mean of its divisors is an integer number (50773653).

Almost surely, 2^201022121 is an apocalyptic number.

It is an amenable number.

201022121 is a deficient number, since it is larger than the sum of its proper divisors (2072491).

201022121 is an equidigital number, since it uses as much as digits as its factorization.

201022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2072490.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 201022121 is about 14178.2270048127. The cubic root of 201022121 is about 585.7980886379.

Adding to 201022121 its reverse (121220102), we get a palindrome (322242223).

The spelling of 201022121 in words is "two hundred one million, twenty-two thousand, one hundred twenty-one".