21101220220200 has 192 divisors, whose sum is σ = 68263848869760. Its totient is φ = 5381868011520.

The previous prime is 21101220220193. The next prime is 21101220220231. The reversal of 21101220220200 is 202202210112.

It is a super-2 number, since 2×21101220220200² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21101220220200.

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, 173501812 + ... + 173623388.

It is an arithmetic number, because the mean of its divisors is an integer number (355540879530).

Almost surely, 2^{21101220220200} is an apocalyptic number.

21101220220200 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 21101220220200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34131924434880).

21101220220200 is an abundant number, since it is smaller than the sum of its proper divisors (47162628649560).

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

21101220220200 is a wasteful number, since it uses less digits than its factorization.

21101220220200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134196 (or 134187 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21101220220200 its reverse (202202210112), we get a palindrome (21303422430312).

The spelling of 21101220220200 in words is "twenty-one trillion, one hundred one billion, two hundred twenty million, two hundred twenty thousand, two hundred".