221388883123 has 4 divisors (see below), whose sum is σ = 221404613040. Its totient is φ = 221373153208.

The previous prime is 221388883073. The next prime is 221388883153. The reversal of 221388883123 is 321388883122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321388883122 = 2 ⋅160694441561.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221388883123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221388883153) 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, 7843828 + ... + 7872001.

It is an arithmetic number, because the mean of its divisors is an integer number (55351153260).

Almost surely, 2^221388883123 is an apocalyptic number.

221388883123 is a deficient number, since it is larger than the sum of its proper divisors (15729917).

221388883123 is a wasteful number, since it uses less digits than its factorization.

221388883123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15729916.

The product of its digits is 884736, while the sum is 49.

Subtracting 221388883123 from its reverse (321388883122), we obtain a palindrome (99999999999).

The spelling of 221388883123 in words is "two hundred twenty-one billion, three hundred eighty-eight million, eight hundred eighty-three thousand, one hundred twenty-three".