221010100220020 has 12 divisors (see below), whose sum is σ = 464121210462084. Its totient is φ = 88404040088000.

The previous prime is 221010100219999. The next prime is 221010100220131. The reversal of 221010100220020 is 20022001010122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 96245400104676 + 124764700115344 = 9810474^2 + 11169812^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5525252505481 + ... + 5525252505520.

It is an arithmetic number, because the mean of its divisors is an integer number (38676767538507).

Almost surely, 2^{221010100220020} is an apocalyptic number.

221010100220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221010100220020 is an abundant number, since it is smaller than the sum of its proper divisors (243111110242064).

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

221010100220020 is a wasteful number, since it uses less digits than its factorization.

221010100220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11050505011010 (or 11050505011008 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221010100220020 its reverse (20022001010122), we get a palindrome (241032101230142).

The spelling of 221010100220020 in words is "two hundred twenty-one trillion, ten billion, one hundred million, two hundred twenty thousand, twenty".