220021121221000 has 64 divisors (see below), whose sum is σ = 561653916744960. Its totient is φ = 80007680440000.

The previous prime is 220021121220997. The next prime is 220021121221039. The reversal of 220021121221000 is 122121120022.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10000949056 + ... + 10000971055.

It is an arithmetic number, because the mean of its divisors is an integer number (8775842449140).

Almost surely, 2^{220021121221000} is an apocalyptic number.

220021121221000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220021121221000 is an abundant number, since it is smaller than the sum of its proper divisors (341632795523960).

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

220021121221000 is a wasteful number, since it uses less digits than its factorization.

220021121221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20001920143 (or 20001920129 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 220021121221000 its reverse (122121120022), we get a palindrome (220143242341022).

The spelling of 220021121221000 in words is "two hundred twenty trillion, twenty-one billion, one hundred twenty-one million, two hundred twenty-one thousand".