221022100121 has 4 divisors (see below), whose sum is σ = 230631756672. Its totient is φ = 211412443572.

The previous prime is 221022100099. The next prime is 221022100129. The reversal of 221022100121 is 121001220122.

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 221022100121 - 2³⁰ = 219948358297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221022100096 and 221022100105.

It is not an unprimeable number, because it can be changed into a prime (221022100129) 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, 4804828241 + ... + 4804828286.

It is an arithmetic number, because the mean of its divisors is an integer number (57657939168).

Almost surely, 2^221022100121 is an apocalyptic number.

It is an amenable number.

221022100121 is a deficient number, since it is larger than the sum of its proper divisors (9609656551).

221022100121 is an equidigital number, since it uses as much as digits as its factorization.

221022100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9609656550.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221022100121 its reverse (121001220122), we get a palindrome (342023320243).

The spelling of 221022100121 in words is "two hundred twenty-one billion, twenty-two million, one hundred thousand, one hundred twenty-one".