23210440042 has 4 divisors (see below), whose sum is σ = 34815660066. Its totient is φ = 11605220020.

The previous prime is 23210440021. The next prime is 23210440151. The reversal of 23210440042 is 24004401232.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 23185848361 + 24591681 = 152269^2 + 4959^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 23210439995 and 23210440022.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5802610009 + ... + 5802610012.

Almost surely, 2^23210440042 is an apocalyptic number.

23210440042 is a deficient number, since it is larger than the sum of its proper divisors (11605220024).

23210440042 is a wasteful number, since it uses less digits than its factorization.

23210440042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11605220023.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 23210440042 its reverse (24004401232), we get a palindrome (47214841274).

The spelling of 23210440042 in words is "twenty-three billion, two hundred ten million, four hundred forty thousand, forty-two".