20210100202091 has 12 divisors (see below), whose sum is σ = 20499452894016. Its totient is φ = 19924776081840.

The previous prime is 20210100202063. The next prime is 20210100202129. The reversal of 20210100202091 is 19020200101202.

It is a happy number.

It is not a de Polignac number, because 20210100202091 - 2²⁶ = 20210033093227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20210100802091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 218718086 + ... + 218810468.

It is an arithmetic number, because the mean of its divisors is an integer number (1708287741168).

Almost surely, 2^{20210100202091} is an apocalyptic number.

20210100202091 is a deficient number, since it is larger than the sum of its proper divisors (289352691925).

20210100202091 is an frugal number, since it uses more digits than its factorization.

20210100202091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135922 (or 135851 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 20210100202091 its reverse (19020200101202), we get a palindrome (39230300303293).

The spelling of 20210100202091 in words is "twenty trillion, two hundred ten billion, one hundred million, two hundred two thousand, ninety-one".