2321561843 has 4 divisors (see below), whose sum is σ = 2324369880. Its totient is φ = 2318753808.

The previous prime is 2321561839. The next prime is 2321561867. The reversal of 2321561843 is 3481651232.

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 2321561843 - 2² = 2321561839 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2321501843) 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, 1402778 + ... + 1404431.

It is an arithmetic number, because the mean of its divisors is an integer number (581092470).

Almost surely, 2^2321561843 is an apocalyptic number.

2321561843 is a deficient number, since it is larger than the sum of its proper divisors (2808037).

2321561843 is an equidigital number, since it uses as much as digits as its factorization.

2321561843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2808036.

The product of its digits is 34560, while the sum is 35.

The square root of 2321561843 is about 48182.5885875801. The cubic root of 2321561843 is about 1324.1181920559.

It can be divided in two parts, 23215 and 61843, that added together give a palindrome (85058).

The spelling of 2321561843 in words is "two billion, three hundred twenty-one million, five hundred sixty-one thousand, eight hundred forty-three".