221221120195 has 4 divisors (see below), whose sum is σ = 265465344240. Its totient is φ = 176976896152.

The previous prime is 221221120189. The next prime is 221221120199. The reversal of 221221120195 is 591021122122.

It is a happy number.

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 221221120195 - 2³ = 221221120187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221221120199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22122112015 + ... + 22122112024.

It is an arithmetic number, because the mean of its divisors is an integer number (66366336060).

Almost surely, 2^221221120195 is an apocalyptic number.

221221120195 is a deficient number, since it is larger than the sum of its proper divisors (44244224045).

221221120195 is an equidigital number, since it uses as much as digits as its factorization.

221221120195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44244224044.

The product of its (nonzero) digits is 1440, while the sum is 28.

The spelling of 221221120195 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred twenty thousand, one hundred ninety-five".