2021221187 has 2 divisors, whose sum is σ = 2021221188. Its totient is φ = 2021221186.

The previous prime is 2021221183. The next prime is 2021221199. The reversal of 2021221187 is 7811221202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021221187 - 2² = 2021221183 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021221183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010610593 + 1010610594.

It is an arithmetic number, because the mean of its divisors is an integer number (1010610594).

Almost surely, 2^2021221187 is an apocalyptic number.

2021221187 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021221187 is an equidigital number, since it uses as much as digits as its factorization.

2021221187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 2021221187 is about 44957.9935828991. The cubic root of 2021221187 is about 1264.3615513141.

Adding to 2021221187 its reverse (7811221202), we get a palindrome (9832442389).

The spelling of 2021221187 in words is "two billion, twenty-one million, two hundred twenty-one thousand, one hundred eighty-seven".