221220002221 has 4 divisors (see below), whose sum is σ = 221230357632. Its totient is φ = 221209646812.

The previous prime is 221220002207. The next prime is 221220002249. The reversal of 221220002221 is 122200022122.

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 221220002221 - 2⁷ = 221220002093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221220002195 and 221220002204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221220002261) 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, 5145595 + ... + 5188408.

It is an arithmetic number, because the mean of its divisors is an integer number (55307589408).

Almost surely, 2^221220002221 is an apocalyptic number.

It is an amenable number.

221220002221 is a deficient number, since it is larger than the sum of its proper divisors (10355411).

221220002221 is a wasteful number, since it uses less digits than its factorization.

221220002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10355410.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 221220002221 its reverse (122200022122), we get a palindrome (343420024343).

The spelling of 221220002221 in words is "two hundred twenty-one billion, two hundred twenty million, two thousand, two hundred twenty-one".