23021047 has 4 divisors (see below), whose sum is σ = 26309776. Its totient is φ = 19732320.

The previous prime is 23021029. The next prime is 23021057. The reversal of 23021047 is 74012032.

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

It is a cyclic number.

It is not a de Polignac number, because 23021047 - 2¹⁵ = 22988279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23021057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1644354 + ... + 1644367.

It is an arithmetic number, because the mean of its divisors is an integer number (6577444).

Almost surely, 2^23021047 is an apocalyptic number.

23021047 is a deficient number, since it is larger than the sum of its proper divisors (3288729).

23021047 is an equidigital number, since it uses as much as digits as its factorization.

23021047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3288728.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 23021047 is about 4798.0253229844. The cubic root of 23021047 is about 284.4734177245.

Adding to 23021047 its reverse (74012032), we get a palindrome (97033079).

The spelling of 23021047 in words is "twenty-three million, twenty-one thousand, forty-seven".