100221111021 has 4 divisors (see below), whose sum is σ = 133628148032. Its totient is φ = 66814074012.

The previous prime is 100221110987. The next prime is 100221111043. The reversal of 100221111021 is 120111122001.

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 not a de Polignac number, because 100221111021 - 2¹⁸ = 100220848877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100221110988 and 100221111006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100221111071) 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, 16703518501 + ... + 16703518506.

It is an arithmetic number, because the mean of its divisors is an integer number (33407037008).

Almost surely, 2^100221111021 is an apocalyptic number.

It is an amenable number.

100221111021 is a deficient number, since it is larger than the sum of its proper divisors (33407037011).

100221111021 is an equidigital number, since it uses as much as digits as its factorization.

100221111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33407037010.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 100221111021 its reverse (120111122001), we get a palindrome (220332233022).

The spelling of 100221111021 in words is "one hundred billion, two hundred twenty-one million, one hundred eleven thousand, twenty-one".