221021100220100 has 72 divisors (see below), whose sum is σ = 481558003731840. Its totient is φ = 88051064411520.

The previous prime is 221021100220091. The next prime is 221021100220133. The reversal of 221021100220100 is 1022001120122.

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, 23804111 + ... + 31759689.

Almost surely, 2^{221021100220100} is an apocalyptic number.

221021100220100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221021100220100 is an abundant number, since it is smaller than the sum of its proper divisors (260536903511740).

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

221021100220100 is a wasteful number, since it uses less digits than its factorization.

221021100220100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7956717 (or 7956710 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221021100220100 its reverse (1022001120122), we get a palindrome (222043101340222).

The spelling of 221021100220100 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred million, two hundred twenty thousand, one hundred".