2021200002091 has 2 divisors, whose sum is σ = 2021200002092. Its totient is φ = 2021200002090.

The previous prime is 2021200002089. The next prime is 2021200002163. The reversal of 2021200002091 is 1902000021202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021200002091 - 2¹ = 2021200002089 is a prime.

Together with 2021200002089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2021200032091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010600001045 + 1010600001046.

It is an arithmetic number, because the mean of its divisors is an integer number (1010600001046).

Almost surely, 2^{2021200002091} is an apocalyptic number.

2021200002091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021200002091 is an equidigital number, since it uses as much as digits as its factorization.

2021200002091 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 19.

Adding to 2021200002091 its reverse (1902000021202), we get a palindrome (3923200023293).

The spelling of 2021200002091 in words is "two trillion, twenty-one billion, two hundred million, two thousand, ninety-one".