21454532 has 12 divisors (see below), whose sum is σ = 40958736. Its totient is φ = 9752040.

The previous prime is 21454483. The next prime is 21454541. The reversal of 21454532 is 23545412.

It is a happy 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 3 ways as a sum of consecutive naturals, for example, 243758 + ... + 243845.

It is an arithmetic number, because the mean of its divisors is an integer number (3413228).

Almost surely, 2^21454532 is an apocalyptic number.

21454532 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21454532 is a deficient number, since it is larger than the sum of its proper divisors (19504204).

21454532 is a wasteful number, since it uses less digits than its factorization.

21454532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487618 (or 487616 counting only the distinct ones).

The product of its digits is 4800, while the sum is 26.

The square root of 21454532 is about 4631.9037122980. The cubic root of 21454532 is about 277.8687336392.

Adding to 21454532 its reverse (23545412), we get a palindrome (44999944).

The spelling of 21454532 in words is "twenty-one million, four hundred fifty-four thousand, five hundred thirty-two".