201121221222020 has 96 divisors (see below), whose sum is σ = 467362165286016. Its totient is φ = 72091888256000.

The previous prime is 201121221221989. The next prime is 201121221222023. The reversal of 201121221222020 is 20222122121102.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 201121221221983 and 201121221222001.

It is not an unprimeable number, because it can be changed into a prime (201121221222023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14892977 + ... + 24980856.

It is an arithmetic number, because the mean of its divisors is an integer number (4868355888396).

Almost surely, 2^{201121221222020} is an apocalyptic number.

201121221222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201121221222020 is an abundant number, since it is smaller than the sum of its proper divisors (266240944063996).

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

201121221222020 is a wasteful number, since it uses less digits than its factorization.

201121221222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39874181 (or 39874179 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 201121221222020 its reverse (20222122121102), we get a palindrome (221343343343122).

It can be divided in two parts, 2011212 and 21222020, that added together give a palindrome (23233232).

The spelling of 201121221222020 in words is "two hundred one trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, twenty".