21367472 has 40 divisors (see below), whose sum is σ = 47782656. Its totient is φ = 9066816.

The previous prime is 21367433. The next prime is 21367481. The reversal of 21367472 is 27476312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11093 + ... + 12875.

Almost surely, 2^21367472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21367472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23891328).

21367472 is an abundant number, since it is smaller than the sum of its proper divisors (26415184).

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

21367472 is a wasteful number, since it uses less digits than its factorization.

21367472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1905 (or 1899 counting only the distinct ones).

The product of its digits is 14112, while the sum is 32.

The square root of 21367472 is about 4622.4962952933. The cubic root of 21367472 is about 277.4923710805.

The spelling of 21367472 in words is "twenty-one million, three hundred sixty-seven thousand, four hundred seventy-two".