2021021222201 has 4 divisors (see below), whose sum is σ = 2021133140004. Its totient is φ = 2020909304400.

The previous prime is 2021021222147. The next prime is 2021021222203. The reversal of 2021021222201 is 1022221201202.

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 1157078856976 + 863942365225 = 1075676^2 + 929485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021021222201 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 2021021222201.

It is not an unprimeable number, because it can be changed into a prime (2021021222203) 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, 55931810 + ... + 55967931.

It is an arithmetic number, because the mean of its divisors is an integer number (505283285001).

Almost surely, 2^{2021021222201} is an apocalyptic number.

It is an amenable number.

2021021222201 is a deficient number, since it is larger than the sum of its proper divisors (111917803).

2021021222201 is a wasteful number, since it uses less digits than its factorization.

2021021222201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111917802.

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

Adding to 2021021222201 its reverse (1022221201202), we get a palindrome (3043242423403).

The spelling of 2021021222201 in words is "two trillion, twenty-one billion, twenty-one million, two hundred twenty-two thousand, two hundred one".