221220201111210 has 192 divisors, whose sum is σ = 657816798412800. Its totient is φ = 50527955592576.

The previous prime is 221220201111199. The next prime is 221220201111229. The reversal of 221220201111210 is 12111102022122.

221220201111210 is a `hidden beast` number, since 2 + 21 + 220 + 201 + 1 + 11 + 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 95 ways as a sum of consecutive naturals, for example, 5709331057 + ... + 5709369803.

It is an arithmetic number, because the mean of its divisors is an integer number (3426129158400).

Almost surely, 2^{221220201111210} is an apocalyptic number.

221220201111210 is an abundant number, since it is smaller than the sum of its proper divisors (436596597301590).

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

221220201111210 is a wasteful number, since it uses less digits than its factorization.

221220201111210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45105 (or 45102 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 221220201111210 its reverse (12111102022122), we get a palindrome (233331303133332).

The spelling of 221220201111210 in words is "two hundred twenty-one trillion, two hundred twenty billion, two hundred one million, one hundred eleven thousand, two hundred ten".