21472328 has 8 divisors (see below), whose sum is σ = 40260630. Its totient is φ = 10736160.

The previous prime is 21472313. The next prime is 21472379. The reversal of 21472328 is 82327412.

It can be written as a sum of positive squares in only one way, i.e., 12096484 + 9375844 = 3478^2 + 3062^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21472328² = 922121739479168, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21472328.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1342013 + ... + 1342028.

Almost surely, 2^21472328 is an apocalyptic number.

It is an amenable number.

21472328 is a deficient number, since it is larger than the sum of its proper divisors (18788302).

21472328 is a wasteful number, since it uses less digits than its factorization.

21472328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2684047 (or 2684043 counting only the distinct ones).

The product of its digits is 5376, while the sum is 29.

The square root of 21472328 is about 4633.8243384919. The cubic root of 21472328 is about 277.9455408048.

It can be divided in two parts, 2 and 1472328, that multiplied together give a square (2944656 = 1716²).

The spelling of 21472328 in words is "twenty-one million, four hundred seventy-two thousand, three hundred twenty-eight".