220100123 has 4 divisors (see below), whose sum is σ = 231684360. Its totient is φ = 208515888.

The previous prime is 220100117. The next prime is 220100129. The reversal of 220100123 is 321001022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321001022 = 2 ⋅160500511.

It is an interprime number because it is at equal distance from previous prime (220100117) and next prime (220100129).

It is a cyclic number.

It is not a de Polignac number, because 220100123 - 2⁶ = 220100059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220100129) 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, 5792090 + ... + 5792127.

It is an arithmetic number, because the mean of its divisors is an integer number (57921090).

Almost surely, 2^220100123 is an apocalyptic number.

220100123 is a deficient number, since it is larger than the sum of its proper divisors (11584237).

220100123 is a wasteful number, since it uses less digits than its factorization.

220100123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11584236.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 220100123 is about 14835.7717359091. The cubic root of 220100123 is about 603.7726391241.

Adding to 220100123 its reverse (321001022), we get a palindrome (541101145).

The spelling of 220100123 in words is "two hundred twenty million, one hundred thousand, one hundred twenty-three".