201221210020220 has 48 divisors (see below), whose sum is σ = 455165860306080. Its totient is φ = 74281330803456.

The previous prime is 201221210020183. The next prime is 201221210020241. The reversal of 201221210020220 is 22020012122102.

It is a happy number.

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, 80703815 + ... + 83159774.

It is an arithmetic number, because the mean of its divisors is an integer number (9482622089710).

Almost surely, 2^{201221210020220} is an apocalyptic number.

201221210020220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201221210020220 is an abundant number, since it is smaller than the sum of its proper divisors (253944650285860).

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

201221210020220 is a wasteful number, since it uses less digits than its factorization.

201221210020220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163868334 (or 163868332 counting only the distinct ones).

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

Adding to 201221210020220 its reverse (22020012122102), we get a palindrome (223241222142322).

The spelling of 201221210020220 in words is "two hundred one trillion, two hundred twenty-one billion, two hundred ten million, twenty thousand, two hundred twenty".