23545021 has 4 divisors (see below), whose sum is σ = 23554972. Its totient is φ = 23535072.

The previous prime is 23544973. The next prime is 23545043. The reversal of 23545021 is 12054532.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 14333796 + 9211225 = 3786^2 + 3035^2 .

It is a cyclic number.

It is not a de Polignac number, because 23545021 - 2²¹ = 21447869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23544983 and 23545001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23545321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 841 + ... + 6913.

It is an arithmetic number, because the mean of its divisors is an integer number (5888743).

Almost surely, 2^23545021 is an apocalyptic number.

It is an amenable number.

23545021 is a deficient number, since it is larger than the sum of its proper divisors (9951).

23545021 is an equidigital number, since it uses as much as digits as its factorization.

23545021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9950.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 23545021 is about 4852.3211971179. The cubic root of 23545021 is about 286.6155138282.

Adding to 23545021 its reverse (12054532), we get a palindrome (35599553).

The spelling of 23545021 in words is "twenty-three million, five hundred forty-five thousand, twenty-one".