202121222201 has 4 divisors (see below), whose sum is σ = 202300250100. Its totient is φ = 201942194304.

The previous prime is 202121222179. The next prime is 202121222207. The reversal of 202121222201 is 102222121202.

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: 102222121202 = 2 ⋅51111060601.

It can be written as a sum of positive squares in 2 ways, for example, as 90434924176 + 111686298025 = 300724^2 + 334195^2 .

It is a cyclic number.

It is not a de Polignac number, because 202121222201 - 2¹⁸ = 202120960057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 202121222201.

It is not an unprimeable number, because it can be changed into a prime (202121222207) 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, 89512256 + ... + 89514513.

It is an arithmetic number, because the mean of its divisors is an integer number (50575062525).

Almost surely, 2^202121222201 is an apocalyptic number.

It is an amenable number.

202121222201 is a deficient number, since it is larger than the sum of its proper divisors (179027899).

202121222201 is a wasteful number, since it uses less digits than its factorization.

202121222201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179027898.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 202121222201 its reverse (102222121202), we get a palindrome (304343343403).

The spelling of 202121222201 in words is "two hundred two billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred one".