21454232 has 16 divisors (see below), whose sum is σ = 41524800. Its totient is φ = 10380960.

The previous prime is 21454217. The next prime is 21454253. The reversal of 21454232 is 23245412.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21454198 and 21454207.

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 3 ways as a sum of consecutive naturals, for example, 43007 + ... + 43502.

It is an arithmetic number, because the mean of its divisors is an integer number (2595300).

Almost surely, 2^21454232 is an apocalyptic number.

It is an amenable number.

21454232 is a deficient number, since it is larger than the sum of its proper divisors (20070568).

21454232 is a wasteful number, since it uses less digits than its factorization.

21454232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86546 (or 86542 counting only the distinct ones).

The product of its digits is 1920, while the sum is 23.

The square root of 21454232 is about 4631.8713280919. The cubic root of 21454232 is about 277.8674384815.

Adding to 21454232 its reverse (23245412), we get a palindrome (44699644).

The spelling of 21454232 in words is "twenty-one million, four hundred fifty-four thousand, two hundred thirty-two".