2021202191 has 2 divisors, whose sum is σ = 2021202192. Its totient is φ = 2021202190.

The previous prime is 2021202187. The next prime is 2021202217. The reversal of 2021202191 is 1912021202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021202191 - 2² = 2021202187 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021202101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010601095 + 1010601096.

It is an arithmetic number, because the mean of its divisors is an integer number (1010601096).

Almost surely, 2^2021202191 is an apocalyptic number.

2021202191 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021202191 is an equidigital number, since it uses as much as digits as its factorization.

2021202191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 2021202191 is about 44957.7823185263. The cubic root of 2021202191 is about 1264.3575903609.

Adding to 2021202191 its reverse (1912021202), we get a palindrome (3933223393).

The spelling of 2021202191 in words is "two billion, twenty-one million, two hundred two thousand, one hundred ninety-one".