23121842 has 4 divisors (see below), whose sum is σ = 34682766. Its totient is φ = 11560920.

The previous prime is 23121821. The next prime is 23121851. The reversal of 23121842 is 24812132.

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., 19439281 + 3682561 = 4409^2 + 1919^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5780459 + ... + 5780462.

Almost surely, 2^23121842 is an apocalyptic number.

23121842 is a deficient number, since it is larger than the sum of its proper divisors (11560924).

23121842 is a wasteful number, since it uses less digits than its factorization.

23121842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11560923.

The product of its digits is 768, while the sum is 23.

The square root of 23121842 is about 4808.5176510022. The cubic root of 23121842 is about 284.8879912778.

Adding to 23121842 its reverse (24812132), we get a palindrome (47933974).

The spelling of 23121842 in words is "twenty-three million, one hundred twenty-one thousand, eight hundred forty-two".