221100120 has 48 divisors (see below), whose sum is σ = 718576560. Its totient is φ = 58959936.

The previous prime is 221100107. The next prime is 221100133. The reversal of 221100120 is 21001122.

221100120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221100107) and next prime (221100133).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 306724 + ... + 307443.

It is an arithmetic number, because the mean of its divisors is an integer number (14970345).

Almost surely, 2^221100120 is an apocalyptic number.

221100120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221100120 is an abundant number, since it is smaller than the sum of its proper divisors (497476440).

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

221100120 is a wasteful number, since it uses less digits than its factorization.

221100120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614184 (or 614177 counting only the distinct ones).

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

The square root of 221100120 is about 14869.4357660269. The cubic root of 221100120 is about 604.6856459491.

Adding to 221100120 its reverse (21001122), we get a palindrome (242101242).

The spelling of 221100120 in words is "two hundred twenty-one million, one hundred thousand, one hundred twenty".