221879123 has 8 divisors (see below), whose sum is σ = 224380416. Its totient is φ = 219384000.

The previous prime is 221879113. The next prime is 221879129. The reversal of 221879123 is 321978122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221879123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221879129) 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, 132590 + ... + 134252.

It is an arithmetic number, because the mean of its divisors is an integer number (28047552).

Almost surely, 2^221879123 is an apocalyptic number.

221879123 is a deficient number, since it is larger than the sum of its proper divisors (2501293).

221879123 is a wasteful number, since it uses less digits than its factorization.

221879123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3085.

The product of its digits is 12096, while the sum is 35.

The square root of 221879123 is about 14895.6075069129. The cubic root of 221879123 is about 605.3949773790.

The spelling of 221879123 in words is "two hundred twenty-one million, eight hundred seventy-nine thousand, one hundred twenty-three".