21260328 has 32 divisors (see below), whose sum is σ = 53541600. Its totient is φ = 7034688.

The previous prime is 21260321. The next prime is 21260329. The reversal of 21260328 is 82306212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 21260298 and 21260307.

It is not an unprimeable number, because it can be changed into a prime (21260321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150 + ... + 6522.

It is an arithmetic number, because the mean of its divisors is an integer number (1673175).

Almost surely, 2^21260328 is an apocalyptic number.

It is an amenable number.

21260328 is an abundant number, since it is smaller than the sum of its proper divisors (32281272).

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

21260328 is a wasteful number, since it uses less digits than its factorization.

21260328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6521 (or 6517 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 21260328 is about 4610.8923214493. The cubic root of 21260328 is about 277.0277789741.

The spelling of 21260328 in words is "twenty-one million, two hundred sixty thousand, three hundred twenty-eight".