21070726 has 8 divisors (see below), whose sum is σ = 31767120. Its totient is φ = 10481688.

The previous prime is 21070703. The next prime is 21070727. The reversal of 21070726 is 62707012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21070726.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21070727) 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, 26346 + ... + 27133.

It is an arithmetic number, because the mean of its divisors is an integer number (3970890).

Almost surely, 2^21070726 is an apocalyptic number.

21070726 is a deficient number, since it is larger than the sum of its proper divisors (10696394).

21070726 is a wasteful number, since it uses less digits than its factorization.

21070726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53678.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 21070726 is about 4590.2860477317. The cubic root of 21070726 is about 276.2017970399.

Adding to 21070726 its reverse (62707012), we get a palindrome (83777738).

The spelling of 21070726 in words is "twenty-one million, seventy thousand, seven hundred twenty-six".