221200120100091 has 128 divisors (see below), whose sum is σ = 342763691212800. Its totient is φ = 125619688535040.

The previous prime is 221200120099993. The next prime is 221200120100107. The reversal of 221200120100091 is 190001021002122.

It is not a de Polignac number, because 221200120100091 - 2¹¹ = 221200120098043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221200120100291) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4592715576 + ... + 4592763738.

It is an arithmetic number, because the mean of its divisors is an integer number (2677841337600).

Almost surely, 2^{221200120100091} is an apocalyptic number.

221200120100091 is a deficient number, since it is larger than the sum of its proper divisors (121563571112709).

221200120100091 is a wasteful number, since it uses less digits than its factorization.

221200120100091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48961.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 221200120100091 in words is "two hundred twenty-one trillion, two hundred billion, one hundred twenty million, one hundred thousand, ninety-one".