221213211210 has 96 divisors (see below), whose sum is σ = 606503626560. Its totient is φ = 55785936384.

The previous prime is 221213211179. The next prime is 221213211217. The reversal of 221213211210 is 12112312122.

221213211210 is a `hidden beast` number, since 221 + 2 + 1 + 321 + 121 + 0 = 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 (221213211217) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 847842 + ... + 1077618.

It is an arithmetic number, because the mean of its divisors is an integer number (6317746110).

Almost surely, 2^221213211210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221213211210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303251813280).

221213211210 is an abundant number, since it is smaller than the sum of its proper divisors (385290415350).

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

221213211210 is a wasteful number, since it uses less digits than its factorization.

221213211210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230372 (or 230369 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 221213211210 its reverse (12112312122), we get a palindrome (233325523332).

The spelling of 221213211210 in words is "two hundred twenty-one billion, two hundred thirteen million, two hundred eleven thousand, two hundred ten".