10001221100100 has 288 divisors, whose sum is σ = 34564387737600. Its totient is φ = 2472865718400.

The previous prime is 10001221100083. The next prime is 10001221100107. The reversal of 10001221100100 is 100112210001.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (10001221100107) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 337105 + ... + 4485095.

It is an arithmetic number, because the mean of its divisors is an integer number (120015235200).

Almost surely, 2^{10001221100100} is an apocalyptic number.

10001221100100 is a gapful number since it is divisible by the number (10) 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 10001221100100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17282193868800).

10001221100100 is an abundant number, since it is smaller than the sum of its proper divisors (24563166637500).

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

10001221100100 is a wasteful number, since it uses less digits than its factorization.

10001221100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4148080 (or 4148067 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 10001221100100 its reverse (100112210001), we get a palindrome (10101333310101).

The spelling of 10001221100100 in words is "ten trillion, one billion, two hundred twenty-one million, one hundred thousand, one hundred".