21260528 has 10 divisors (see below), whose sum is σ = 41192304. Its totient is φ = 10630256.

The previous prime is 21260527. The next prime is 21260531. The reversal of 21260528 is 82506212.

It is a junction number, because it is equal to n+sod(n) for n = 21260497 and 21260506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21260521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664376 + ... + 664407.

Almost surely, 2^21260528 is an apocalyptic number.

It is an amenable number.

21260528 is a deficient number, since it is larger than the sum of its proper divisors (19931776).

21260528 is a wasteful number, since it uses less digits than its factorization.

21260528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328791 (or 1328785 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 21260528 is about 4610.9140091743. The cubic root of 21260528 is about 277.0286476560.

The spelling of 21260528 in words is "twenty-one million, two hundred sixty thousand, five hundred twenty-eight".