221323210020 has 72 divisors (see below), whose sum is σ = 732378628800. Its totient is φ = 53654111040.

The previous prime is 221323209953. The next prime is 221323210021. The reversal of 221323210020 is 20012323122.

221323210020 is a `hidden beast` number, since 221 + 323 + 2 + 100 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 221323209975 and 221323210002.

It is not an unprimeable number, because it can be changed into a prime (221323210021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55887720 + ... + 55891679.

It is an arithmetic number, because the mean of its divisors is an integer number (10171925400).

Almost surely, 2^221323210020 is an apocalyptic number.

221323210020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221323210020 is an abundant number, since it is smaller than the sum of its proper divisors (511055418780).

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

221323210020 is a wasteful number, since it uses less digits than its factorization.

221323210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111779425 (or 111779420 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 221323210020 its reverse (20012323122), we get a palindrome (241335533142).

The spelling of 221323210020 in words is "two hundred twenty-one billion, three hundred twenty-three million, two hundred ten thousand, twenty".