2321250721 has 4 divisors (see below), whose sum is σ = 2321541700. Its totient is φ = 2320959744.

The previous prime is 2321250719. The next prime is 2321250739. The reversal of 2321250721 is 1270521232.

2321250721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 854743696 + 1466507025 = 29236^2 + 38295^2 .

It is a cyclic number.

It is not a de Polignac number, because 2321250721 - 2¹ = 2321250719 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2321250221) 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, 133176 + ... + 149593.

It is an arithmetic number, because the mean of its divisors is an integer number (580385425).

Almost surely, 2^2321250721 is an apocalyptic number.

It is an amenable number.

2321250721 is a deficient number, since it is larger than the sum of its proper divisors (290979).

2321250721 is an equidigital number, since it uses as much as digits as its factorization.

2321250721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290978.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 2321250721 is about 48179.3599064994. The cubic root of 2321250721 is about 1324.0590392481.

Adding to 2321250721 its reverse (1270521232), we get a palindrome (3591771953).

The spelling of 2321250721 in words is "two billion, three hundred twenty-one million, two hundred fifty thousand, seven hundred twenty-one".