221131303020 has 96 divisors (see below), whose sum is σ = 688040740800. Its totient is φ = 58961774592.

The previous prime is 221131303007. The next prime is 221131303037. The reversal of 221131303020 is 20303131122.

221131303020 is a `hidden beast` number, since 221 + 13 + 130 + 302 + 0 = 666.

It is a super-2 number, since 2×221131303020² (a number of 23 digits) contains 22 as substring.

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 = 221131302984 and 221131303002.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6608572 + ... + 6641948.

It is an arithmetic number, because the mean of its divisors is an integer number (7167091050).

Almost surely, 2^221131303020 is an apocalyptic number.

221131303020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221131303020 is an abundant number, since it is smaller than the sum of its proper divisors (466909437780).

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

221131303020 is a wasteful number, since it uses less digits than its factorization.

221131303020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45664 (or 45656 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 221131303020 its reverse (20303131122), we get a palindrome (241434434142).

The spelling of 221131303020 in words is "two hundred twenty-one billion, one hundred thirty-one million, three hundred three thousand, twenty".