20102110112221 has 4 divisors (see below), whose sum is σ = 20481395208732. Its totient is φ = 19722825015712.

The previous prime is 20102110112209. The next prime is 20102110112257. The reversal of 20102110112221 is 12221101120102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9692543491225 + 10409566620996 = 3113285^2 + 3226386^2 .

It is a cyclic number.

It is not a de Polignac number, because 20102110112221 - 2¹⁵ = 20102110079453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20102110112195 and 20102110112204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102110112921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189642548176 + ... + 189642548281.

It is an arithmetic number, because the mean of its divisors is an integer number (5120348802183).

Almost surely, 2^{20102110112221} is an apocalyptic number.

It is an amenable number.

20102110112221 is a deficient number, since it is larger than the sum of its proper divisors (379285096511).

20102110112221 is an equidigital number, since it uses as much as digits as its factorization.

20102110112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379285096510.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20102110112221 its reverse (12221101120102), we get a palindrome (32323211232323).

The spelling of 20102110112221 in words is "twenty trillion, one hundred two billion, one hundred ten million, one hundred twelve thousand, two hundred twenty-one".