21220200020100 has 144 divisors (see below), whose sum is σ = 61512806678400. Its totient is φ = 5648060774400.

The previous prime is 21220200020099. The next prime is 21220200020147. The reversal of 21220200020100 is 102000202212.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 1307378985 + ... + 1307395215.

It is an arithmetic number, because the mean of its divisors is an integer number (427172268600).

Almost surely, 2^{21220200020100} is an apocalyptic number.

21220200020100 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 21220200020100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30756403339200).

21220200020100 is an abundant number, since it is smaller than the sum of its proper divisors (40292606658300).

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

21220200020100 is a wasteful number, since it uses less digits than its factorization.

21220200020100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24190 (or 24183 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21220200020100 its reverse (102000202212), we get a palindrome (21322200222312).

The spelling of 21220200020100 in words is "twenty-one trillion, two hundred twenty billion, two hundred million, twenty thousand, one hundred".