221700123 has 6 divisors (see below), whose sum is σ = 320233524. Its totient is φ = 147800076.

The previous prime is 221700107. The next prime is 221700137. The reversal of 221700123 is 321007122.

221700123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221700123 - 2⁴ = 221700107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221700096 and 221700105.

It is not an unprimeable number, because it can be changed into a prime (221700103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12316665 + ... + 12316682.

It is an arithmetic number, because the mean of its divisors is an integer number (53372254).

Almost surely, 2^221700123 is an apocalyptic number.

221700123 is a deficient number, since it is larger than the sum of its proper divisors (98533401).

221700123 is a wasteful number, since it uses less digits than its factorization.

221700123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24633353 (or 24633350 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 221700123 is about 14889.5978118954. The cubic root of 221700123 is about 605.2321336742.

Adding to 221700123 its reverse (321007122), we get a palindrome (542707245).

The spelling of 221700123 in words is "two hundred twenty-one million, seven hundred thousand, one hundred twenty-three".