21532452 has 12 divisors (see below), whose sum is σ = 50242416. Its totient is φ = 7177480.

The previous prime is 21532417. The next prime is 21532499. The reversal of 21532452 is 25423512.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 897174 + ... + 897197.

It is an arithmetic number, because the mean of its divisors is an integer number (4186868).

Almost surely, 2^21532452 is an apocalyptic number.

It is an amenable number.

21532452 is an abundant number, since it is smaller than the sum of its proper divisors (28709964).

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

21532452 is a wasteful number, since it uses less digits than its factorization.

21532452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794378 (or 1794376 counting only the distinct ones).

The product of its digits is 2400, while the sum is 24.

The square root of 21532452 is about 4640.3073174091. The cubic root of 21532452 is about 278.2047212783.

Adding to 21532452 its reverse (25423512), we get a palindrome (46955964).

The spelling of 21532452 in words is "twenty-one million, five hundred thirty-two thousand, four hundred fifty-two".