20210110100091 has 24 divisors (see below), whose sum is σ = 30202644108000. Its totient is φ = 13007243233152.

The previous prime is 20210110100057. The next prime is 20210110100107. The reversal of 20210110100091 is 19000101101202.

It is a happy number.

It is not a de Polignac number, because 20210110100091 - 2¹⁸ = 20210109837947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20210110100891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2474551 + ... + 6822288.

It is an arithmetic number, because the mean of its divisors is an integer number (1258443504500).

Almost surely, 2^{20210110100091} is an apocalyptic number.

20210110100091 is a deficient number, since it is larger than the sum of its proper divisors (9992534007909).

20210110100091 is a wasteful number, since it uses less digits than its factorization.

20210110100091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9305203 (or 9305200 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

Adding to 20210110100091 its reverse (19000101101202), we get a palindrome (39210211201293).

The spelling of 20210110100091 in words is "twenty trillion, two hundred ten billion, one hundred ten million, one hundred thousand, ninety-one".