221210304121 has 4 divisors (see below), whose sum is σ = 223875488592. Its totient is φ = 218545119652.

The previous prime is 221210304113. The next prime is 221210304163. The reversal of 221210304121 is 121403012122.

221210304121 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 221210304121 - 2³ = 221210304113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221210304181) 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, 1332592111 + ... + 1332592276.

It is an arithmetic number, because the mean of its divisors is an integer number (55968872148).

Almost surely, 2^221210304121 is an apocalyptic number.

It is an amenable number.

221210304121 is a deficient number, since it is larger than the sum of its proper divisors (2665184471).

221210304121 is an equidigital number, since it uses as much as digits as its factorization.

221210304121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2665184470.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 221210304121 its reverse (121403012122), we get a palindrome (342613316243).

The spelling of 221210304121 in words is "two hundred twenty-one billion, two hundred ten million, three hundred four thousand, one hundred twenty-one".