21054332 has 48 divisors (see below), whose sum is σ = 42185472. Its totient is φ = 9123840.

The previous prime is 21054329. The next prime is 21054343. The reversal of 21054332 is 23345012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 59468 + ... + 59820.

It is an arithmetic number, because the mean of its divisors is an integer number (878864).

Almost surely, 2^21054332 is an apocalyptic number.

It is a pronic number, being equal to 4588×4589.

It is an amenable number.

21054332 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

21054332 is a wasteful number, since it uses less digits than its factorization.

21054332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438 (or 436 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 21054332 is about 4588.4999727580. The cubic root of 21054332 is about 276.1301458604.

Adding to 21054332 its reverse (23345012), we get a palindrome (44399344).

It can be divided in two parts, 210543 and 32, that multiplied together give a palindrome (6737376).

The spelling of 21054332 in words is "twenty-one million, fifty-four thousand, three hundred thirty-two".