221020120 has 32 divisors (see below), whose sum is σ = 498034800. Its totient is φ = 88276608.

The previous prime is 221020099. The next prime is 221020127. The reversal of 221020120 is 21020122.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 221020097 and 221020106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25822 + ... + 33298.

Almost surely, 2^221020120 is an apocalyptic number.

221020120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221020120 is an abundant number, since it is smaller than the sum of its proper divisors (277014680).

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

221020120 is a wasteful number, since it uses less digits than its factorization.

221020120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8227 (or 8223 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 221020120 is about 14866.7454407480. The cubic root of 221020120 is about 604.6127066139.

Adding to 221020120 its reverse (21020122), we get a palindrome (242040242).

The spelling of 221020120 in words is "two hundred twenty-one million, twenty thousand, one hundred twenty".