201221100221020 has 48 divisors (see below), whose sum is σ = 461547656631936. Its totient is φ = 73081085544000.

The previous prime is 201221100220967. The next prime is 201221100221123. The reversal of 201221100221020 is 20122001122102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 201221100220985 and 201221100221003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 563718846 + ... + 564075685.

It is an arithmetic number, because the mean of its divisors is an integer number (9615576179832).

Almost surely, 2^{201221100221020} is an apocalyptic number.

201221100221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201221100221020 is an abundant number, since it is smaller than the sum of its proper divisors (260326556410916).

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

201221100221020 is a wasteful number, since it uses less digits than its factorization.

201221100221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127795362 (or 1127795360 counting only the distinct ones).

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

Adding to 201221100221020 its reverse (20122001122102), we get a palindrome (221343101343122).

The spelling of 201221100221020 in words is "two hundred one trillion, two hundred twenty-one billion, one hundred million, two hundred twenty-one thousand, twenty".