221010120 has 80 divisors (see below), whose sum is σ = 742850460. Its totient is φ = 58935168.

The previous prime is 221010113. The next prime is 221010133. The reversal of 221010120 is 21010122.

It can be written as a sum of positive squares in 2 ways, for example, as 216266436 + 4743684 = 14706^2 + 2178^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 30867 + ... + 37346.

Almost surely, 2^221010120 is an apocalyptic number.

221010120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221010120 is an abundant number, since it is smaller than the sum of its proper divisors (521840340).

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

221010120 is a wasteful number, since it uses less digits than its factorization.

221010120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68236 (or 68223 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 221010120 is about 14866.4091158558. The cubic root of 221010120 is about 604.6035879595.

Adding to 221010120 its reverse (21010122), we get a palindrome (242020242).

The spelling of 221010120 in words is "two hundred twenty-one million, ten thousand, one hundred twenty".