21075526 has 8 divisors (see below), whose sum is σ = 31994424. Its totient is φ = 10410720.

The previous prime is 21075497. The next prime is 21075559. The reversal of 21075526 is 62557012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21075494 and 21075503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63315 + ... + 63646.

It is an arithmetic number, because the mean of its divisors is an integer number (3999303).

Almost surely, 2^21075526 is an apocalyptic number.

21075526 is a deficient number, since it is larger than the sum of its proper divisors (10918898).

21075526 is a wasteful number, since it uses less digits than its factorization.

21075526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127046.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 21075526 is about 4590.8088611921. The cubic root of 21075526 is about 276.2227687578. Note that the first 3 decimals are identical.

The spelling of 21075526 in words is "twenty-one million, seventy-five thousand, five hundred twenty-six".