221100222020021 has 4 divisors (see below), whose sum is σ = 221677507195392. Its totient is φ = 220522936844652.

The previous prime is 221100222019979. The next prime is 221100222020057. The reversal of 221100222020021 is 120020222001122.

It is a happy number.

221100222020021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221100222020021 - 2¹⁴ = 221100222003637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221100222020221) 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, 288642587111 + ... + 288642587876.

It is an arithmetic number, because the mean of its divisors is an integer number (55419376798848).

Almost surely, 2^{221100222020021} is an apocalyptic number.

It is an amenable number.

221100222020021 is a deficient number, since it is larger than the sum of its proper divisors (577285175371).

221100222020021 is an equidigital number, since it uses as much as digits as its factorization.

221100222020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577285175370.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221100222020021 its reverse (120020222001122), we get a palindrome (341120444021143).

The spelling of 221100222020021 in words is "two hundred twenty-one trillion, one hundred billion, two hundred twenty-two million, twenty thousand, twenty-one".