221110020 has 48 divisors (see below), whose sum is σ = 687899520. Its totient is φ = 58962528.

The previous prime is 221110013. The next prime is 221110027. The reversal of 221110020 is 20011122.

It is an interprime number because it is at equal distance from previous prime (221110013) and next prime (221110027).

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

It is a junction number, because it is equal to n+sod(n) for n = 221109984 and 221110011.

It is not an unprimeable number, because it can be changed into a prime (221110027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204192 + ... + 205271.

It is an arithmetic number, because the mean of its divisors is an integer number (14331240).

Almost surely, 2^221110020 is an apocalyptic number.

221110020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221110020 is an abundant number, since it is smaller than the sum of its proper divisors (466789500).

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

221110020 is a wasteful number, since it uses less digits than its factorization.

221110020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409481 (or 409473 counting only the distinct ones).

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

The square root of 221110020 is about 14869.7686599355. The cubic root of 221110020 is about 604.6946709684.

Adding to 221110020 its reverse (20011122), we get a palindrome (241121142).

The spelling of 221110020 in words is "two hundred twenty-one million, one hundred ten thousand, twenty".