21368726 has 8 divisors (see below), whose sum is σ = 32108400. Its totient is φ = 10665928.

The previous prime is 21368723. The next prime is 21368729. The reversal of 21368726 is 62786312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21368723) and next prime (21368729).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21368723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7721 + ... + 10116.

It is an arithmetic number, because the mean of its divisors is an integer number (4013550).

Almost surely, 2^21368726 is an apocalyptic number.

21368726 is a deficient number, since it is larger than the sum of its proper divisors (10739674).

21368726 is a wasteful number, since it uses less digits than its factorization.

21368726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18438.

The product of its digits is 24192, while the sum is 35.

The square root of 21368726 is about 4622.6319342989. The cubic root of 21368726 is about 277.4977994036.

The spelling of 21368726 in words is "twenty-one million, three hundred sixty-eight thousand, seven hundred twenty-six".