21342528 has 140 divisors (see below), whose sum is σ = 66385440. Its totient is φ = 6766848.

The previous prime is 21342523. The next prime is 21342533. The reversal of 21342528 is 82524312.

21342528 is a `hidden beast` number, since 2 + 134 + 2 + 528 = 666.

It is an interprime number because it is at equal distance from previous prime (21342523) and next prime (21342533).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342523) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 119143 + ... + 119321.

Almost surely, 2^21342528 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21342528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33192720).

21342528 is an abundant number, since it is smaller than the sum of its proper divisors (45042912).

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

21342528 is a wasteful number, since it uses less digits than its factorization.

21342528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 207 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 21342528 is about 4619.7973981550. The cubic root of 21342528 is about 277.3843491784.

The spelling of 21342528 in words is "twenty-one million, three hundred forty-two thousand, five hundred twenty-eight".