221100202021 has 4 divisors (see below), whose sum is σ = 221101296544. Its totient is φ = 221099107500.

The previous prime is 221100202007. The next prime is 221100202051. The reversal of 221100202021 is 120202001122.

It is a happy number.

221100202021 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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 221100202021 - 2³⁵ = 186740463653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221100201992 and 221100202010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221100202051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146355 + ... + 680896.

It is an arithmetic number, because the mean of its divisors is an integer number (55275324136).

Almost surely, 2^221100202021 is an apocalyptic number.

It is an amenable number.

221100202021 is a deficient number, since it is larger than the sum of its proper divisors (1094523).

221100202021 is an equidigital number, since it uses as much as digits as its factorization.

221100202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094522.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221100202021 its reverse (120202001122), we get a palindrome (341302203143).

The spelling of 221100202021 in words is "two hundred twenty-one billion, one hundred million, two hundred two thousand, twenty-one".