221221022110100 has 72 divisors (see below), whose sum is σ = 482900535512640. Its totient is φ = 87963240395520.

The previous prime is 221221022110097. The next prime is 221221022110141. The reversal of 221221022110100 is 1011220122122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48977417 + ... + 53303183.

It is an arithmetic number, because the mean of its divisors is an integer number (6706951882120).

Almost surely, 2^{221221022110100} is an apocalyptic number.

221221022110100 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 221221022110100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241450267756320).

221221022110100 is an abundant number, since it is smaller than the sum of its proper divisors (261679513402540).

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

221221022110100 is a wasteful number, since it uses less digits than its factorization.

221221022110100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4328817 (or 4328810 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221221022110100 its reverse (1011220122122), we get a palindrome (222232242232222).

The spelling of 221221022110100 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, twenty-two million, one hundred ten thousand, one hundred".