221989405123 has 8 divisors (see below), whose sum is σ = 224823281760. Its totient is φ = 219170024640.

The previous prime is 221989405111. The next prime is 221989405147. The reversal of 221989405123 is 321504989122.

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 221989405123 - 2⁵ = 221989405091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221989405103) 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, 3593215 + ... + 3654472.

It is an arithmetic number, because the mean of its divisors is an integer number (28102910220).

Almost surely, 2^221989405123 is an apocalyptic number.

221989405123 is a deficient number, since it is larger than the sum of its proper divisors (2833876637).

221989405123 is a wasteful number, since it uses less digits than its factorization.

221989405123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7248077.

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 221989405123 in words is "two hundred twenty-one billion, nine hundred eighty-nine million, four hundred five thousand, one hundred twenty-three".