221011221111210 has 48 divisors (see below), whose sum is σ = 584368652443680. Its totient is φ = 57937404854880.

The previous prime is 221011221111199. The next prime is 221011221111221. The reversal of 221011221111210 is 12111122110122.

It is a happy number.

221011221111210 is a `hidden beast` number, since 2 + 210 + 11 + 221 + 1 + 11 + 210 = 666.

It is an interprime number because it is at equal distance from previous prime (221011221111199) and next prime (221011221111221).

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20810844136 + ... + 20810854755.

It is an arithmetic number, because the mean of its divisors is an integer number (12174346925910).

Almost surely, 2^{221011221111210} is an apocalyptic number.

221011221111210 is an abundant number, since it is smaller than the sum of its proper divisors (363357431332470).

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

221011221111210 is a wasteful number, since it uses less digits than its factorization.

221011221111210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41621698963 (or 41621698960 counting only the distinct ones).

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

Adding to 221011221111210 its reverse (12111122110122), we get a palindrome (233122343221332).

The spelling of 221011221111210 in words is "two hundred twenty-one trillion, eleven billion, two hundred twenty-one million, one hundred eleven thousand, two hundred ten".