202121221100220 has 96 divisors (see below), whose sum is σ = 628860179787840. Its totient is φ = 53895683462400.

The previous prime is 202121221100189. The next prime is 202121221100221. The reversal of 202121221100220 is 22001122121202.

It is a happy number.

202121221100220 is a `hidden beast` number, since 2 + 0 + 2 + 121 + 221 + 100 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 202121221100193 and 202121221100202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202121221100221) 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, 2678307 + ... + 20283386.

It is an arithmetic number, because the mean of its divisors is an integer number (6550626872790).

Almost surely, 2^{202121221100220} is an apocalyptic number.

202121221100220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202121221100220 is an abundant number, since it is smaller than the sum of its proper divisors (426738958687620).

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

202121221100220 is a wasteful number, since it uses less digits than its factorization.

202121221100220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22978012 (or 22978004 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 202121221100220 its reverse (22001122121202), we get a palindrome (224122343221422).

The spelling of 202121221100220 in words is "two hundred two trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred thousand, two hundred twenty".