201021210001091 has 2 divisors, whose sum is σ = 201021210001092. Its totient is φ = 201021210001090.

The previous prime is 201021210001069. The next prime is 201021210001097. The reversal of 201021210001091 is 190100012120102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201021210001091 - 2²² = 201021205806787 is a prime.

It is not a weakly prime, because it can be changed into another prime (201021210001097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510605000545 + 100510605000546.

It is an arithmetic number, because the mean of its divisors is an integer number (100510605000546).

Almost surely, 2^{201021210001091} is an apocalyptic number.

201021210001091 is a deficient number, since it is larger than the sum of its proper divisors (1).

201021210001091 is an equidigital number, since it uses as much as digits as its factorization.

201021210001091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 201021210001091 its reverse (190100012120102), we get a palindrome (391121222121193).

The spelling of 201021210001091 in words is "two hundred one trillion, twenty-one billion, two hundred ten million, one thousand, ninety-one".