221200109979 has 4 divisors (see below), whose sum is σ = 294933479976. Its totient is φ = 147466739984.

The previous prime is 221200109959. The next prime is 221200109983. The reversal of 221200109979 is 979901002122.

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 221200109979 - 2⁵ = 221200109947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221200109979.

It is not an unprimeable number, because it can be changed into a prime (221200109959) 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, 36866684994 + ... + 36866684999.

It is an arithmetic number, because the mean of its divisors is an integer number (73733369994).

Almost surely, 2^221200109979 is an apocalyptic number.

221200109979 is a deficient number, since it is larger than the sum of its proper divisors (73733369997).

221200109979 is an equidigital number, since it uses as much as digits as its factorization.

221200109979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73733369996.

The product of its (nonzero) digits is 40824, while the sum is 42.

The spelling of 221200109979 in words is "two hundred twenty-one billion, two hundred million, one hundred nine thousand, nine hundred seventy-nine".