20100112021221 has 4 divisors (see below), whose sum is σ = 26800149361632. Its totient is φ = 13400074680812.

The previous prime is 20100112021217. The next prime is 20100112021247. The reversal of 20100112021221 is 12212021100102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20100112021221 - 2² = 20100112021217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20100112021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100112021201) 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 3 ways as a sum of consecutive naturals, for example, 3350018670201 + ... + 3350018670206.

It is an arithmetic number, because the mean of its divisors is an integer number (6700037340408).

Almost surely, 2^{20100112021221} is an apocalyptic number.

It is an amenable number.

20100112021221 is a deficient number, since it is larger than the sum of its proper divisors (6700037340411).

20100112021221 is an equidigital number, since it uses as much as digits as its factorization.

20100112021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6700037340410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20100112021221 its reverse (12212021100102), we get a palindrome (32312133121323).

The spelling of 20100112021221 in words is "twenty trillion, one hundred billion, one hundred twelve million, twenty-one thousand, two hundred twenty-one".