221222221010 has 128 divisors (see below), whose sum is σ = 492413022720. Its totient is φ = 69873463296.

The previous prime is 221222220977. The next prime is 221222221027. The reversal of 221222221010 is 10122222122.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 221222221010.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7951484 + ... + 7979256.

It is an arithmetic number, because the mean of its divisors is an integer number (3846976740).

Almost surely, 2^221222221010 is an apocalyptic number.

221222221010 is an abundant number, since it is smaller than the sum of its proper divisors (271190801710).

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

221222221010 is a wasteful number, since it uses less digits than its factorization.

221222221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27972.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221222221010 its reverse (10122222122), we get a palindrome (231344443132).

The spelling of 221222221010 in words is "two hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, ten".