23042721 has 8 divisors (see below), whose sum is σ = 33087040. Its totient is φ = 14180112.

The previous prime is 23042713. The next prime is 23042729. The reversal of 23042721 is 12724032.

It is an interprime number because it is at equal distance from previous prime (23042713) and next prime (23042729).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23042721 - 2³ = 23042713 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23042729) 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, 295381 + ... + 295458.

It is an arithmetic number, because the mean of its divisors is an integer number (4135880).

Almost surely, 2^23042721 is an apocalyptic number.

It is an amenable number.

23042721 is a deficient number, since it is larger than the sum of its proper divisors (10044319).

23042721 is a wasteful number, since it uses less digits than its factorization.

23042721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590855.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 23042721 is about 4800.2834291321. The cubic root of 23042721 is about 284.5626656621.

Adding to 23042721 its reverse (12724032), we get a palindrome (35766753).

The spelling of 23042721 in words is "twenty-three million, forty-two thousand, seven hundred twenty-one".