21200220112100 has 144 divisors (see below), whose sum is σ = 50443966254528. Its totient is φ = 7701722972160.

The previous prime is 21200220112091. The next prime is 21200220112171. The reversal of 21200220112100 is 121102200212.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4320212 + ... + 7814388.

It is an arithmetic number, because the mean of its divisors is an integer number (350305321212).

Almost surely, 2^{21200220112100} is an apocalyptic number.

21200220112100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21200220112100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25221983127264).

21200220112100 is an abundant number, since it is smaller than the sum of its proper divisors (29243746142428).

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

21200220112100 is a wasteful number, since it uses less digits than its factorization.

21200220112100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3494334 (or 3494327 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21200220112100 its reverse (121102200212), we get a palindrome (21321322312312).

The spelling of 21200220112100 in words is "twenty-one trillion, two hundred billion, two hundred twenty million, one hundred twelve thousand, one hundred".