221221102210 has 8 divisors (see below), whose sum is σ = 398197983996. Its totient is φ = 88488440880.

The previous prime is 221221102183. The next prime is 221221102237. The reversal of 221221102210 is 12201122122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (221221102183) and next prime (221221102237).

It can be written as a sum of positive squares in 2 ways, for example, as 219474447361 + 1746654849 = 468481^2 + 41793^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11061055101 + ... + 11061055120.

Almost surely, 2^221221102210 is an apocalyptic number.

221221102210 is a deficient number, since it is larger than the sum of its proper divisors (176976881786).

221221102210 is a wasteful number, since it uses less digits than its factorization.

221221102210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22122110228.

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

Adding to 221221102210 its reverse (12201122122), we get a palindrome (233422224332).

The spelling of 221221102210 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred two thousand, two hundred ten".