221022102210 has 384 divisors, whose sum is σ = 713925010944. Its totient is φ = 42699571200.

The previous prime is 221022102167. The next prime is 221022102239. The reversal of 221022102210 is 12201220122.

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

221022102210 is a modest number, since divided by 22102210 gives 2210 as remainder.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221022102210.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 22318260 + ... + 22328160.

It is an arithmetic number, because the mean of its divisors is an integer number (1859179716).

Almost surely, 2^221022102210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221022102210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (356962505472).

221022102210 is an abundant number, since it is smaller than the sum of its proper divisors (492902908734).

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

221022102210 is a wasteful number, since it uses less digits than its factorization.

221022102210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9998 (or 9985 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221022102210 its reverse (12201220122), we get a palindrome (233223322332).

The spelling of 221022102210 in words is "two hundred twenty-one billion, twenty-two million, one hundred two thousand, two hundred ten".