221111210112210 has 256 divisors, whose sum is σ = 644159174400000. Its totient is φ = 53525561045760.

The previous prime is 221111210112113. The next prime is 221111210112257. The reversal of 221111210112210 is 12211012111122.

It is a happy number.

221111210112210 is a `hidden beast` number, since 2 + 21 + 111 + 210 + 112 + 210 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6016776916 + ... + 6016813664.

It is an arithmetic number, because the mean of its divisors is an integer number (2516246775000).

Almost surely, 2^{221111210112210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221111210112210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (322079587200000).

221111210112210 is an abundant number, since it is smaller than the sum of its proper divisors (423047964287790).

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

221111210112210 is a wasteful number, since it uses less digits than its factorization.

221111210112210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39638 (or 39632 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 221111210112210 its reverse (12211012111122), we get a palindrome (233322222223332).

The spelling of 221111210112210 in words is "two hundred twenty-one trillion, one hundred eleven billion, two hundred ten million, one hundred twelve thousand, two hundred ten".