21100100200220 has 48 divisors (see below), whose sum is σ = 44973534587520. Its totient is φ = 8313703700544.

The previous prime is 21100100200213. The next prime is 21100100200261. The reversal of 21100100200220 is 2200200100112.

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, 31207787 + ... + 31876733.

It is an arithmetic number, because the mean of its divisors is an integer number (936948637240).

Almost surely, 2^{21100100200220} is an apocalyptic number.

21100100200220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100100200220 is an abundant number, since it is smaller than the sum of its proper divisors (23873434387300).

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

21100100200220 is a wasteful number, since it uses less digits than its factorization.

21100100200220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692562 (or 692560 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21100100200220 its reverse (2200200100112), we get a palindrome (23300300300332).

The spelling of 21100100200220 in words is "twenty-one trillion, one hundred billion, one hundred million, two hundred thousand, two hundred twenty".