221011212210 has 16 divisors (see below), whose sum is σ = 530426909376. Its totient is φ = 58936323248.

The previous prime is 221011212209. The next prime is 221011212221. The reversal of 221011212210 is 12212110122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221011212210.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3683520174 + ... + 3683520233.

It is an arithmetic number, because the mean of its divisors is an integer number (33151681836).

Almost surely, 2^221011212210 is an apocalyptic number.

221011212210 is an abundant number, since it is smaller than the sum of its proper divisors (309415697166).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221011212210 is a wasteful number, since it uses less digits than its factorization.

221011212210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7367040417.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221011212210 its reverse (12212110122), we get a palindrome (233223322332).

The spelling of 221011212210 in words is "two hundred twenty-one billion, eleven million, two hundred twelve thousand, two hundred ten".