221010020 has 48 divisors (see below), whose sum is σ = 578648448. Its totient is φ = 68885760.

The previous prime is 221010011. The next prime is 221010037. The reversal of 221010020 is 20010122.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70217 + ... + 73296.

It is an arithmetic number, because the mean of its divisors is an integer number (12055176).

Almost surely, 2^221010020 is an apocalyptic number.

221010020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221010020 is an abundant number, since it is smaller than the sum of its proper divisors (357638428).

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

221010020 is a wasteful number, since it uses less digits than its factorization.

221010020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143540 (or 143538 counting only the distinct ones).

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

The square root of 221010020 is about 14866.4057525684. The cubic root of 221010020 is about 604.6034967716.

Adding to 221010020 its reverse (20010122), we get a palindrome (241020142).

The spelling of 221010020 in words is "two hundred twenty-one million, ten thousand, twenty".