23430420221 has 16 divisors (see below), whose sum is σ = 26724197808. Its totient is φ = 20350387200.

The previous prime is 23430420203. The next prime is 23430420241. The reversal of 23430420221 is 12202403432.

It can be written as a sum of positive squares in 8 ways, for example, as 1492663225 + 21937756996 = 38635^2 + 148114^2 .

It is not a de Polignac number, because 23430420221 - 2⁶ = 23430420157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23430420241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 965051 + ... + 989031.

It is an arithmetic number, because the mean of its divisors is an integer number (1670262363).

Almost surely, 2^23430420221 is an apocalyptic number.

It is an amenable number.

23430420221 is a deficient number, since it is larger than the sum of its proper divisors (3293777587).

23430420221 is a wasteful number, since it uses less digits than its factorization.

23430420221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28432.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 23430420221 its reverse (12202403432), we get a palindrome (35632823653).

The spelling of 23430420221 in words is "twenty-three billion, four hundred thirty million, four hundred twenty thousand, two hundred twenty-one".