221211202120110 has 160 divisors (see below), whose sum is σ = 604928443565952. Its totient is φ = 57987572267520.

The previous prime is 221211202120079. The next prime is 221211202120121. The reversal of 221211202120110 is 11021202112122.

221211202120110 is a `hidden beast` number, since 2 + 21 + 211 + 202 + 120 + 110 = 666.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 80521419 + ... + 83223321.

Almost surely, 2^{221211202120110} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221211202120110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302464221782976).

221211202120110 is an abundant number, since it is smaller than the sum of its proper divisors (383717241445842).

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

221211202120110 is a wasteful number, since it uses less digits than its factorization.

221211202120110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2703640 (or 2703631 counting only the distinct ones).

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

Adding to 221211202120110 its reverse (11021202112122), we get a palindrome (232232404232232).

The spelling of 221211202120110 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred two million, one hundred twenty thousand, one hundred ten".