21524052 has 24 divisors (see below), whose sum is σ = 54788832. Its totient is φ = 6522400.

The previous prime is 21524029. The next prime is 21524059. The reversal of 21524052 is 25042512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21524059) 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 7 ways as a sum of consecutive naturals, for example, 81399 + ... + 81662.

It is an arithmetic number, because the mean of its divisors is an integer number (2282868).

Almost surely, 2^21524052 is an apocalyptic number.

21524052 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21524052 is an abundant number, since it is smaller than the sum of its proper divisors (33264780).

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

21524052 is a wasteful number, since it uses less digits than its factorization.

21524052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163079 (or 163077 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 21524052 is about 4639.4021166525. The cubic root of 21524052 is about 278.1685398654.

Adding to 21524052 its reverse (25042512), we get a palindrome (46566564).

The spelling of 21524052 in words is "twenty-one million, five hundred twenty-four thousand, fifty-two".