21325434 has 24 divisors (see below), whose sum is σ = 46186272. Its totient is φ = 6561360.

The previous prime is 21325433. The next prime is 21325441. The reversal of 21325434 is 43452312.

It is a Curzon number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (21325433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9502 + ... + 11529.

It is an arithmetic number, because the mean of its divisors is an integer number (1924428).

Almost surely, 2^21325434 is an apocalyptic number.

21325434 is an abundant number, since it is smaller than the sum of its proper divisors (24860838).

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

21325434 is a wasteful number, since it uses less digits than its factorization.

21325434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21062 (or 21049 counting only the distinct ones).

The product of its digits is 2880, while the sum is 24.

The square root of 21325434 is about 4617.9469464254. The cubic root of 21325434 is about 277.3102736903.

Adding to 21325434 its reverse (43452312), we get a palindrome (64777746).

The spelling of 21325434 in words is "twenty-one million, three hundred twenty-five thousand, four hundred thirty-four".