2021222201 has 4 divisors (see below), whose sum is σ = 2041234404. Its totient is φ = 2001210000.

The previous prime is 2021222197. The next prime is 2021222237. The reversal of 2021222201 is 1022221202.

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 1879135801 + 142086400 = 43349^2 + 11920^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021222201 - 2² = 2021222197 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 (2021222501) 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, 10005950 + ... + 10006151.

It is an arithmetic number, because the mean of its divisors is an integer number (510308601).

Almost surely, 2^2021222201 is an apocalyptic number.

It is an amenable number.

2021222201 is a deficient number, since it is larger than the sum of its proper divisors (20012203).

2021222201 is a wasteful number, since it uses less digits than its factorization.

2021222201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20012202.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2021222201 is about 44958.0048600914. The cubic root of 2021222201 is about 1264.3617627477.

Adding to 2021222201 its reverse (1022221202), we get a palindrome (3043443403).

Subtracting from 2021222201 its reverse (1022221202), we obtain a palindrome (999000999).

The spelling of 2021222201 in words is "two billion, twenty-one million, two hundred twenty-two thousand, two hundred one".