201221222020100 has 36 divisors (see below), whose sum is σ = 436673847519924. Its totient is φ = 80484102497280.

The previous prime is 201221222020087. The next prime is 201221222020151. The reversal of 201221222020100 is 1020222122102.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 16429986705664 + 184791235314436 = 4053392^2 + 13593794^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52984409 + ... + 56655008.

Almost surely, 2^{201221222020100} is an apocalyptic number.

201221222020100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201221222020100 is an abundant number, since it is smaller than the sum of its proper divisors (235452625499824).

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

201221222020100 is a wasteful number, since it uses less digits than its factorization.

201221222020100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109657784 (or 109657777 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 201221222020100 its reverse (1020222122102), we get a palindrome (202241444142202).

The spelling of 201221222020100 in words is "two hundred one trillion, two hundred twenty-one billion, two hundred twenty-two million, twenty thousand, one hundred".