1000200021091 has 2 divisors, whose sum is σ = 1000200021092. Its totient is φ = 1000200021090.

The previous prime is 1000200021089. The next prime is 1000200021113. The reversal of 1000200021091 is 1901200020001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1000200021091 - 2¹ = 1000200021089 is a prime.

Together with 1000200021089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1000200021791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500100010545 + 500100010546.

It is an arithmetic number, because the mean of its divisors is an integer number (500100010546).

Almost surely, 2^{1000200021091} is an apocalyptic number.

1000200021091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000200021091 is an equidigital number, since it uses as much as digits as its factorization.

1000200021091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 1000200021091 its reverse (1901200020001), we get a palindrome (2901400041092).

The spelling of 1000200021091 in words is "one trillion, two hundred million, twenty-one thousand, ninety-one".