201121222201 has 4 divisors (see below), whose sum is σ = 202402249252. Its totient is φ = 199840195152.

The previous prime is 201121222171. The next prime is 201121222243. The reversal of 201121222201 is 102222121102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 102222121102 = 2 ⋅51111060551.

It can be written as a sum of positive squares in 2 ways, for example, as 16925749801 + 184195472400 = 130099^2 + 429180^2 .

It is a cyclic number.

It is not a de Polignac number, because 201121222201 - 2¹⁵ = 201121189433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201121222271) 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, 640513290 + ... + 640513603.

It is an arithmetic number, because the mean of its divisors is an integer number (50600562313).

Almost surely, 2^201121222201 is an apocalyptic number.

It is an amenable number.

201121222201 is a deficient number, since it is larger than the sum of its proper divisors (1281027051).

201121222201 is a wasteful number, since it uses less digits than its factorization.

201121222201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281027050.

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

Adding to 201121222201 its reverse (102222121102), we get a palindrome (303343343303).

The spelling of 201121222201 in words is "two hundred one billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred one".