21275726 has 8 divisors (see below), whose sum is σ = 31933224. Its totient is φ = 10631320.

The previous prime is 21275711. The next prime is 21275731. The reversal of 21275726 is 62757212.

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 = 21275692 and 21275701.

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, 4256 + ... + 7788.

It is an arithmetic number, because the mean of its divisors is an integer number (3991653).

Almost surely, 2^21275726 is an apocalyptic number.

21275726 is a deficient number, since it is larger than the sum of its proper divisors (10657498).

21275726 is a wasteful number, since it uses less digits than its factorization.

21275726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6546.

The product of its digits is 11760, while the sum is 32.

The square root of 21275726 is about 4612.5617611041. The cubic root of 21275726 is about 277.0946428585.

The spelling of 21275726 in words is "twenty-one million, two hundred seventy-five thousand, seven hundred twenty-six".