221221100995 has 4 divisors (see below), whose sum is σ = 265465321200. Its totient is φ = 176976880792.

The previous prime is 221221100987. The next prime is 221221101029. The reversal of 221221100995 is 599001122122.

221221100995 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221221100995 - 2³ = 221221100987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221221100995.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22122110095 + ... + 22122110104.

It is an arithmetic number, because the mean of its divisors is an integer number (66366330300).

Almost surely, 2^221221100995 is an apocalyptic number.

221221100995 is a deficient number, since it is larger than the sum of its proper divisors (44244220205).

221221100995 is an equidigital number, since it uses as much as digits as its factorization.

221221100995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44244220204.

The product of its (nonzero) digits is 6480, while the sum is 34.

The spelling of 221221100995 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred thousand, nine hundred ninety-five".