21202426 has 8 divisors (see below), whose sum is σ = 36347040. Its totient is φ = 9086748.

The previous prime is 21202421. The next prime is 21202427. The reversal of 21202426 is 62420212.

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

It is not an unprimeable number, because it can be changed into a prime (21202421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757216 + ... + 757243.

It is an arithmetic number, because the mean of its divisors is an integer number (4543380).

Almost surely, 2^21202426 is an apocalyptic number.

21202426 is a deficient number, since it is larger than the sum of its proper divisors (15144614).

21202426 is a wasteful number, since it uses less digits than its factorization.

21202426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1514468.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 21202426 is about 4604.6092125174. The cubic root of 21202426 is about 276.7760574505.

Adding to 21202426 its reverse (62420212), we get a palindrome (83622638).

The spelling of 21202426 in words is "twenty-one million, two hundred two thousand, four hundred twenty-six".