21426307 has 8 divisors (see below), whose sum is σ = 25927776. Its totient is φ = 17284992.

The previous prime is 21426289. The next prime is 21426329. The reversal of 21426307 is 70362412.

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

It is a cyclic number.

It is not a de Polignac number, because 21426307 - 2¹⁹ = 20902019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21426337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89908 + ... + 90145.

It is an arithmetic number, because the mean of its divisors is an integer number (3240972).

Almost surely, 2^21426307 is an apocalyptic number.

21426307 is a deficient number, since it is larger than the sum of its proper divisors (4501469).

21426307 is a wasteful number, since it uses less digits than its factorization.

21426307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180077.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 21426307 is about 4628.8559061608. The cubic root of 21426307 is about 277.7468279769.

Adding to 21426307 its reverse (70362412), we get a palindrome (91788719).

The spelling of 21426307 in words is "twenty-one million, four hundred twenty-six thousand, three hundred seven".