21434328 has 32 divisors (see below), whose sum is σ = 59540400. Its totient is φ = 7144704.

The previous prime is 21434327. The next prime is 21434341. The reversal of 21434328 is 82343412.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434323) 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 7 ways as a sum of consecutive naturals, for example, 49401 + ... + 49832.

Almost surely, 2^21434328 is an apocalyptic number.

It is an amenable number.

21434328 is an abundant number, since it is smaller than the sum of its proper divisors (38106072).

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

21434328 is a wasteful number, since it uses less digits than its factorization.

21434328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99248 (or 99238 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 21434328 is about 4629.7222378886. The cubic root of 21434328 is about 277.7814820958.

The spelling of 21434328 in words is "twenty-one million, four hundred thirty-four thousand, three hundred twenty-eight".