21266726 has 8 divisors (see below), whose sum is σ = 34353984. Its totient is φ = 9815400.

The previous prime is 21266669. The next prime is 21266731. The reversal of 21266726 is 62766212.

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 = 21266692 and 21266701.

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, 408950 + ... + 409001.

It is an arithmetic number, because the mean of its divisors is an integer number (4294248).

Almost surely, 2^21266726 is an apocalyptic number.

21266726 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21266726 is a deficient number, since it is larger than the sum of its proper divisors (13087258).

21266726 is a wasteful number, since it uses less digits than its factorization.

21266726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817966.

The product of its digits is 12096, while the sum is 32.

The square root of 21266726 is about 4611.5860612158. The cubic root of 21266726 is about 277.0555654060.

The spelling of 21266726 in words is "twenty-one million, two hundred sixty-six thousand, seven hundred twenty-six".