221321123 has 8 divisors (see below), whose sum is σ = 222498960. Its totient is φ = 220147200.

The previous prime is 221321119. The next prime is 221321131. The reversal of 221321123 is 321123122.

221321123 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 221321123 - 2² = 221321119 is a prime.

It is a super-2 number, since 2×221321123² = 97966078971962258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221321323) 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, 218843 + ... + 219851.

It is an arithmetic number, because the mean of its divisors is an integer number (27812370).

Almost surely, 2^221321123 is an apocalyptic number.

221321123 is a deficient number, since it is larger than the sum of its proper divisors (1177837).

221321123 is a wasteful number, since it uses less digits than its factorization.

221321123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1957.

The product of its digits is 144, while the sum is 17.

The square root of 221321123 is about 14876.8653620311. The cubic root of 221321123 is about 604.8870522024.

Adding to 221321123 its reverse (321123122), we get a palindrome (542444245).

The spelling of 221321123 in words is "two hundred twenty-one million, three hundred twenty-one thousand, one hundred twenty-three".