21334524 has 48 divisors (see below), whose sum is σ = 55012608. Its totient is φ = 6400768.

The previous prime is 21334499. The next prime is 21334559. The reversal of 21334524 is 42543312.

It is a junction number, because it is equal to n+sod(n) for n = 21334494 and 21334503.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2419 + ... + 6965.

It is an arithmetic number, because the mean of its divisors is an integer number (1146096).

Almost surely, 2^21334524 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 21334524, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27506304).

21334524 is an abundant number, since it is smaller than the sum of its proper divisors (33678084).

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

21334524 is a wasteful number, since it uses less digits than its factorization.

21334524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4594 (or 4592 counting only the distinct ones).

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

The square root of 21334524 is about 4618.9310451662. The cubic root of 21334524 is about 277.3496694077.

Adding to 21334524 its reverse (42543312), we get a palindrome (63877836).

The spelling of 21334524 in words is "twenty-one million, three hundred thirty-four thousand, five hundred twenty-four".