221002331221 has 4 divisors (see below), whose sum is σ = 252574092832. Its totient is φ = 189430569612.

The previous prime is 221002331197. The next prime is 221002331237. The reversal of 221002331221 is 122133200122.

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 221002331221 - 2¹³ = 221002323029 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 (221002335221) 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, 15785880795 + ... + 15785880808.

It is an arithmetic number, because the mean of its divisors is an integer number (63143523208).

Almost surely, 2^221002331221 is an apocalyptic number.

It is an amenable number.

221002331221 is a deficient number, since it is larger than the sum of its proper divisors (31571761611).

221002331221 is an equidigital number, since it uses as much as digits as its factorization.

221002331221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31571761610.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 221002331221 its reverse (122133200122), we get a palindrome (343135531343).

The spelling of 221002331221 in words is "two hundred twenty-one billion, two million, three hundred thirty-one thousand, two hundred twenty-one".