23036721 has 16 divisors (see below), whose sum is σ = 33024000. Its totient is φ = 14238288.

The previous prime is 23036669. The next prime is 23036723. The reversal of 23036721 is 12763032.

It is not a de Polignac number, because 23036721 - 2¹⁴ = 23020337 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 23036691 and 23036700.

It is not an unprimeable number, because it can be changed into a prime (23036723) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 1621 + ... + 6978.

It is an arithmetic number, because the mean of its divisors is an integer number (2064000).

Almost surely, 2^23036721 is an apocalyptic number.

It is an amenable number.

23036721 is a deficient number, since it is larger than the sum of its proper divisors (9987279).

23036721 is a wasteful number, since it uses less digits than its factorization.

23036721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8668.

The product of its (nonzero) digits is 1512, while the sum is 24.

The square root of 23036721 is about 4799.6584253465. The cubic root of 23036721 is about 284.5379648147.

Adding to 23036721 its reverse (12763032), we get a palindrome (35799753).

The spelling of 23036721 in words is "twenty-three million, thirty-six thousand, seven hundred twenty-one".