221210109979 has 8 divisors (see below), whose sum is σ = 222610123008. Its totient is φ = 219810994920.

The previous prime is 221210109971. The next prime is 221210109997. The reversal of 221210109979 is 979901012122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221210109979 - 2³ = 221210109971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221210109971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273234 + ... + 719080.

It is an arithmetic number, because the mean of its divisors is an integer number (27826265376).

Almost surely, 2^221210109979 is an apocalyptic number.

221210109979 is a deficient number, since it is larger than the sum of its proper divisors (1400013029).

221210109979 is a wasteful number, since it uses less digits than its factorization.

221210109979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448985.

The product of its (nonzero) digits is 40824, while the sum is 43.

The spelling of 221210109979 in words is "two hundred twenty-one billion, two hundred ten million, one hundred nine thousand, nine hundred seventy-nine".