21152432 has 20 divisors (see below), whose sum is σ = 46837776. Its totient is φ = 9065280.

The previous prime is 21152423. The next prime is 21152441. The reversal of 21152432 is 23425112.

It is an interprime number because it is at equal distance from previous prime (21152423) and next prime (21152441).

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, 94319 + ... + 94542.

Almost surely, 2^21152432 is an apocalyptic number.

It is an amenable number.

21152432 is an abundant number, since it is smaller than the sum of its proper divisors (25685344).

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

21152432 is a wasteful number, since it uses less digits than its factorization.

21152432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188876 (or 188870 counting only the distinct ones).

The product of its digits is 480, while the sum is 20.

The square root of 21152432 is about 4599.1773177385. The cubic root of 21152432 is about 276.5583460089.

Adding to 21152432 its reverse (23425112), we get a palindrome (44577544).

The spelling of 21152432 in words is "twenty-one million, one hundred fifty-two thousand, four hundred thirty-two".