2021012220191 has 2 divisors, whose sum is σ = 2021012220192. Its totient is φ = 2021012220190.

The previous prime is 2021012220163. The next prime is 2021012220229. The reversal of 2021012220191 is 1910222101202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021012220191 - 2¹⁸ = 2021011958047 is a prime.

It is a super-2 number, since 2×2021012220191² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021012220391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010506110095 + 1010506110096.

It is an arithmetic number, because the mean of its divisors is an integer number (1010506110096).

Almost surely, 2^{2021012220191} is an apocalyptic number.

2021012220191 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021012220191 is an equidigital number, since it uses as much as digits as its factorization.

2021012220191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

Adding to 2021012220191 its reverse (1910222101202), we get a palindrome (3931234321393).

The spelling of 2021012220191 in words is "two trillion, twenty-one billion, twelve million, two hundred twenty thousand, one hundred ninety-one".