221121012211100 has 72 divisors (see below), whose sum is σ = 483778401044400. Its totient is φ = 87721857932800.

The previous prime is 221121012211081. The next prime is 221121012211129. The reversal of 221121012211100 is 1112210121122.

It is a super-2 number, since 2×221121012211100² (a number of 29 digits) contains 22 as substring.

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, 17449496 + ... + 27326304.

It is an arithmetic number, because the mean of its divisors is an integer number (6719144458950).

Almost surely, 2^{221121012211100} is an apocalyptic number.

221121012211100 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 221121012211100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241889200522200).

221121012211100 is an abundant number, since it is smaller than the sum of its proper divisors (262657388833300).

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

221121012211100 is a wasteful number, since it uses less digits than its factorization.

221121012211100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9878663 (or 9878656 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221121012211100 its reverse (1112210121122), we get a palindrome (222233222332222).

The spelling of 221121012211100 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, twelve million, two hundred eleven thousand, one hundred".