21452672 has 32 divisors (see below), whose sum is σ = 44992200. Its totient is φ = 10160640.

The previous prime is 21452671. The next prime is 21452677. The reversal of 21452672 is 27625412.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21452671) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1979 + ... + 6842.

Almost surely, 2^21452672 is an apocalyptic number.

It is an amenable number.

21452672 is an abundant number, since it is smaller than the sum of its proper divisors (23539528).

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

21452672 is an equidigital number, since it uses as much as digits as its factorization.

21452672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8854 (or 8842 counting only the distinct ones).

The product of its digits is 6720, while the sum is 29.

The square root of 21452672 is about 4631.7029265703. The cubic root of 21452672 is about 277.8607034667.

The spelling of 21452672 in words is "twenty-one million, four hundred fifty-two thousand, six hundred seventy-two".