221023020 has 24 divisors (see below), whose sum is σ = 618864624. Its totient is φ = 58939456.

The previous prime is 221023013. The next prime is 221023037. The reversal of 221023020 is 20320122.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 221022987 and 221023005.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1841799 + ... + 1841918.

It is an arithmetic number, because the mean of its divisors is an integer number (25786026).

Almost surely, 2^221023020 is an apocalyptic number.

221023020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221023020 is an abundant number, since it is smaller than the sum of its proper divisors (397841604).

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

221023020 is a wasteful number, since it uses less digits than its factorization.

221023020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3683729 (or 3683727 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 221023020 is about 14866.8429735435. The cubic root of 221023020 is about 604.6153509722.

Adding to 221023020 its reverse (20320122), we get a palindrome (241343142).

The spelling of 221023020 in words is "two hundred twenty-one million, twenty-three thousand, twenty".