2304540021 has 24 divisors (see below), whose sum is σ = 3607206240. Its totient is φ = 1304789472.

The previous prime is 2304540019. The next prime is 2304540023. The reversal of 2304540021 is 1200454032.

It is an interprime number because it is at equal distance from previous prime (2304540019) and next prime (2304540023).

It is not a de Polignac number, because 2304540021 - 2¹ = 2304540019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 2304540021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2304540023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55891 + ... + 87936.

It is an arithmetic number, because the mean of its divisors is an integer number (150300260).

Almost surely, 2^2304540021 is an apocalyptic number.

2304540021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2304540021 is a deficient number, since it is larger than the sum of its proper divisors (1302666219).

2304540021 is a wasteful number, since it uses less digits than its factorization.

2304540021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143953 (or 143946 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 2304540021 is about 48005.6248891731. The cubic root of 2304540021 is about 1320.8740807362.

Adding to 2304540021 its reverse (1200454032), we get a palindrome (3504994053).

The spelling of 2304540021 in words is "two billion, three hundred four million, five hundred forty thousand, twenty-one".