221001113123 has 4 divisors (see below), whose sum is σ = 252572700720. Its totient is φ = 189429525528.

The previous prime is 221001113101. The next prime is 221001113227. The reversal of 221001113123 is 321311100122.

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 221001113123 - 2⁶ = 221001113059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221001113323) 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, 15785793788 + ... + 15785793801.

It is an arithmetic number, because the mean of its divisors is an integer number (63143175180).

Almost surely, 2^221001113123 is an apocalyptic number.

221001113123 is a deficient number, since it is larger than the sum of its proper divisors (31571587597).

221001113123 is an equidigital number, since it uses as much as digits as its factorization.

221001113123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31571587596.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 221001113123 its reverse (321311100122), we get a palindrome (542312213245).

The spelling of 221001113123 in words is "two hundred twenty-one billion, one million, one hundred thirteen thousand, one hundred twenty-three".