221101212210 has 16 divisors (see below), whose sum is σ = 530642909376. Its totient is φ = 58960323248.

The previous prime is 221101212191. The next prime is 221101212221. The reversal of 221101212210 is 12212101122.

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 221101212210.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3685020174 + ... + 3685020233.

It is an arithmetic number, because the mean of its divisors is an integer number (33165181836).

Almost surely, 2^221101212210 is an apocalyptic number.

221101212210 is an abundant number, since it is smaller than the sum of its proper divisors (309541697166).

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

221101212210 is a wasteful number, since it uses less digits than its factorization.

221101212210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7370040417.

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

Adding to 221101212210 its reverse (12212101122), we get a palindrome (233313313332).

It can be divided in two parts, 2211012 and 12210, that added together give a palindrome (2223222).

The spelling of 221101212210 in words is "two hundred twenty-one billion, one hundred one million, two hundred twelve thousand, two hundred ten".