221111222210 has 8 divisors (see below), whose sum is σ = 398000199996. Its totient is φ = 88444488880.

The previous prime is 221111222179. The next prime is 221111222309. The reversal of 221111222210 is 12222111122.

It can be written as a sum of positive squares in 2 ways, for example, as 209702632489 + 11408589721 = 457933^2 + 106811^2 .

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, 11055561101 + ... + 11055561120.

Almost surely, 2^221111222210 is an apocalyptic number.

221111222210 is a deficient number, since it is larger than the sum of its proper divisors (176888977786).

221111222210 is a wasteful number, since it uses less digits than its factorization.

221111222210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22111122228.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221111222210 its reverse (12222111122), we get a palindrome (233333333332).

It can be divided in two parts, 2211112 and 22210, that added together give a palindrome (2233322).

The spelling of 221111222210 in words is "two hundred twenty-one billion, one hundred eleven million, two hundred twenty-two thousand, two hundred ten".