23421330 has 48 divisors (see below), whose sum is σ = 61250904. Its totient is φ = 6209280.

The previous prime is 23421323. The next prime is 23421331. The reversal of 23421330 is 3312432.

It can be written as a sum of positive squares in 4 ways, for example, as 23126481 + 294849 = 4809^2 + 543^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23421331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17070 + ... + 18390.

Almost surely, 2^23421330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23421330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30625452).

23421330 is an abundant number, since it is smaller than the sum of its proper divisors (37829574).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23421330 is a wasteful number, since it uses less digits than its factorization.

23421330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531 (or 1528 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 23421330 is about 4839.5588641941. The cubic root of 23421330 is about 286.1127320597.

Adding to 23421330 its reverse (3312432), we get a palindrome (26733762).

It can be divided in two parts, 234 and 21330, that multiplied together give a triangular number (4991220 = T₃₁₅₉).

The spelling of 23421330 in words is "twenty-three million, four hundred twenty-one thousand, three hundred thirty".