23403030221 has 4 divisors (see below), whose sum is σ = 23405595132. Its totient is φ = 23400465312.

The previous prime is 23403030199. The next prime is 23403030251. The reversal of 23403030221 is 12203030432.

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 2561776996 + 20841253225 = 50614^2 + 144365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23403030221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23403030193 and 23403030202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23403030251) 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, 1268720 + ... + 1287033.

It is an arithmetic number, because the mean of its divisors is an integer number (5851398783).

Almost surely, 2^23403030221 is an apocalyptic number.

It is an amenable number.

23403030221 is a deficient number, since it is larger than the sum of its proper divisors (2564911).

23403030221 is an equidigital number, since it uses as much as digits as its factorization.

23403030221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2564910.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 23403030221 its reverse (12203030432), we get a palindrome (35606060653).

The spelling of 23403030221 in words is "twenty-three billion, four hundred three million, thirty thousand, two hundred twenty-one".