221111220101000 has 128 divisors (see below), whose sum is σ = 522649122334560. Its totient is φ = 87547668480000.

The previous prime is 221111220100961. The next prime is 221111220101027. The reversal of 221111220101000 is 101022111122.

It can be written as a sum of positive squares in 16 ways, for example, as 5072431866436 + 216038788234564 = 2252206^2 + 14698258^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 421614944 + ... + 422139056.

Almost surely, 2^{221111220101000} is an apocalyptic number.

221111220101000 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 221111220101000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261324561167280).

221111220101000 is an abundant number, since it is smaller than the sum of its proper divisors (301537902233560).

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

221111220101000 is a wasteful number, since it uses less digits than its factorization.

221111220101000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528412 (or 528398 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221111220101000 its reverse (101022111122), we get a palindrome (221212242212122).

The spelling of 221111220101000 in words is "two hundred twenty-one trillion, one hundred eleven billion, two hundred twenty million, one hundred one thousand".