221011120021100 has 144 divisors (see below), whose sum is σ = 494490482416896. Its totient is φ = 85708126080000.

The previous prime is 221011120021057. The next prime is 221011120021157. The reversal of 221011120021100 is 1120021110122.

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, 136585982 + ... + 138194618.

Almost surely, 2^{221011120021100} is an apocalyptic number.

221011120021100 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 221011120021100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247245241208448).

221011120021100 is an abundant number, since it is smaller than the sum of its proper divisors (273479362395796).

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

221011120021100 is a wasteful number, since it uses less digits than its factorization.

221011120021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609036 (or 1609029 counting only the distinct ones).

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

Adding to 221011120021100 its reverse (1120021110122), we get a palindrome (222131141131222).

The spelling of 221011120021100 in words is "two hundred twenty-one trillion, eleven billion, one hundred twenty million, twenty-one thousand, one hundred".