1220221200020 has 24 divisors (see below), whose sum is σ = 2587835460168. Its totient is φ = 483255920000.

The previous prime is 1220221200017. The next prime is 1220221200059. The reversal of 1220221200020 is 200021220221.

It can be written as a sum of positive squares in 4 ways, for example, as 663970744336 + 556250455684 = 814844^2 + 745822^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1220221199968 and 1220221200004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302032931 + ... + 302036970.

It is an arithmetic number, because the mean of its divisors is an integer number (107826477507).

Almost surely, 2^{1220221200020} is an apocalyptic number.

1220221200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220221200020 is an abundant number, since it is smaller than the sum of its proper divisors (1367614260148).

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

1220221200020 is a wasteful number, since it uses less digits than its factorization.

1220221200020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604070011 (or 604070009 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 1220221200020 its reverse (200021220221), we get a palindrome (1420242420241).

It can be divided in two parts, 1220221 and 200020, that added together give a palindrome (1420241).

The spelling of 1220221200020 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred thousand, twenty".