221012102221 has 4 divisors (see below), whose sum is σ = 222122716000. Its totient is φ = 219901488444.

The previous prime is 221012102209. The next prime is 221012102263. The reversal of 221012102221 is 122201210122.

It is a happy number.

221012102221 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 221012102221 - 2⁵ = 221012102189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221012102195 and 221012102204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012105221) 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, 555306591 + ... + 555306988.

It is an arithmetic number, because the mean of its divisors is an integer number (55530679000).

Almost surely, 2^221012102221 is an apocalyptic number.

It is an amenable number.

221012102221 is a deficient number, since it is larger than the sum of its proper divisors (1110613779).

221012102221 is a wasteful number, since it uses less digits than its factorization.

221012102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110613778.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221012102221 its reverse (122201210122), we get a palindrome (343213312343).

The spelling of 221012102221 in words is "two hundred twenty-one billion, twelve million, one hundred two thousand, two hundred twenty-one".