1020221100020 has 12 divisors (see below), whose sum is σ = 2142464310084. Its totient is φ = 408088440000.

The previous prime is 1020221099971. The next prime is 1020221100023. The reversal of 1020221100020 is 200011220201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 529363925476 + 490857174544 = 727574^2 + 700612^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1020221099974 and 1020221100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020221100023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25505527481 + ... + 25505527520.

It is an arithmetic number, because the mean of its divisors is an integer number (178538692507).

Almost surely, 2^{1020221100020} is an apocalyptic number.

1020221100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020221100020 is an abundant number, since it is smaller than the sum of its proper divisors (1122243210064).

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

1020221100020 is a wasteful number, since it uses less digits than its factorization.

1020221100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51011055010 (or 51011055008 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1020221100020 its reverse (200011220201), we get a palindrome (1220232320221).

The spelling of 1020221100020 in words is "one trillion, twenty billion, two hundred twenty-one million, one hundred thousand, twenty".