23021645 has 8 divisors (see below), whose sum is σ = 28004856. Its totient is φ = 18164736.

The previous prime is 23021639. The next prime is 23021653. The reversal of 23021645 is 54612032.

It can be written as a sum of positive squares in 4 ways, for example, as 841 + 23020804 = 29^2 + 4798^2 .

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

It is not a de Polignac number, because 23021645 - 2¹⁴ = 23005261 is a prime.

It is a super-3 number, since 3×23021645³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23021645.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 31172 + ... + 31901.

It is an arithmetic number, because the mean of its divisors is an integer number (3500607).

Almost surely, 2^23021645 is an apocalyptic number.

It is an amenable number.

23021645 is a deficient number, since it is larger than the sum of its proper divisors (4983211).

23021645 is an equidigital number, since it uses as much as digits as its factorization.

23021645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63151.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 23021645 is about 4798.0876398832. The cubic root of 23021645 is about 284.4758808854.

Adding to 23021645 its reverse (54612032), we get a palindrome (77633677).

The spelling of 23021645 in words is "twenty-three million, twenty-one thousand, six hundred forty-five".