221321123123 has 8 divisors (see below), whose sum is σ = 221772166320. Its totient is φ = 220870298880.

The previous prime is 221321123117. The next prime is 221321123131. The reversal of 221321123123 is 321321123122.

221321123123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221321123123 - 2³⁶ = 152601646387 is a prime.

It is a super-2 number, since 2×221321123123² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221321183123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2050988 + ... + 2156198.

It is an arithmetic number, because the mean of its divisors is an integer number (27721520790).

Almost surely, 2^221321123123 is an apocalyptic number.

221321123123 is a deficient number, since it is larger than the sum of its proper divisors (451043197).

221321123123 is a wasteful number, since it uses less digits than its factorization.

221321123123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109477.

The product of its digits is 864, while the sum is 23.

Adding to 221321123123 its reverse (321321123122), we get a palindrome (542642246245).

Subtracting 221321123123 from its reverse (321321123122), we obtain a palindrome (99999999999).

The spelling of 221321123123 in words is "two hundred twenty-one billion, three hundred twenty-one million, one hundred twenty-three thousand, one hundred twenty-three".