20212021221100 has 18 divisors (see below), whose sum is σ = 43860086050004. Its totient is φ = 8084808488400.

The previous prime is 20212021221097. The next prime is 20212021221101. The reversal of 20212021221100 is 112212021202.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20212021221101) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 101060106006 + ... + 101060106205.

Almost surely, 2^{20212021221100} is an apocalyptic number.

20212021221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20212021221100 is an abundant number, since it is smaller than the sum of its proper divisors (23648064828904).

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

20212021221100 is a wasteful number, since it uses less digits than its factorization.

20212021221100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202120212225 (or 202120212218 counting only the distinct ones).

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

Adding to 20212021221100 its reverse (112212021202), we get a palindrome (20324233242302).

The spelling of 20212021221100 in words is "twenty trillion, two hundred twelve billion, twenty-one million, two hundred twenty-one thousand, one hundred".