221211222210 has 64 divisors (see below), whose sum is σ = 643523564160. Its totient is φ = 53626962240.

The previous prime is 221211222179. The next prime is 221211222217. The reversal of 221211222210 is 12222112122.

It is a happy number.

221211222210 is a `hidden beast` number, since 2 + 21 + 211 + 222 + 210 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (221211222217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37237977 + ... + 37243916.

It is an arithmetic number, because the mean of its divisors is an integer number (10055055690).

Almost surely, 2^221211222210 is an apocalyptic number.

221211222210 is an abundant number, since it is smaller than the sum of its proper divisors (422312341950).

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

221211222210 is a wasteful number, since it uses less digits than its factorization.

221211222210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74481920 (or 74481914 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221211222210 its reverse (12222112122), we get a palindrome (233433334332).

It can be divided in two parts, 2212112 and 22210, that added together give a palindrome (2234322).

The spelling of 221211222210 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred twenty-two thousand, two hundred ten".