21352928 has 24 divisors (see below), whose sum is σ = 42731640. Its totient is φ = 10500480.

The previous prime is 21352927. The next prime is 21352931. The reversal of 21352928 is 82925312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 21352894 and 21352903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352921) 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, 3518 + ... + 7421.

It is an arithmetic number, because the mean of its divisors is an integer number (1780485).

Almost surely, 2^21352928 is an apocalyptic number.

It is an amenable number.

21352928 is an abundant number, since it is smaller than the sum of its proper divisors (21378712).

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

21352928 is a wasteful number, since it uses less digits than its factorization.

21352928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11010 (or 11002 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 21352928 is about 4620.9228515525. The cubic root of 21352928 is about 277.4293973998.

The spelling of 21352928 in words is "twenty-one million, three hundred fifty-two thousand, nine hundred twenty-eight".