21226246 has 4 divisors (see below), whose sum is σ = 31839372. Its totient is φ = 10613122.

The previous prime is 21226241. The next prime is 21226277. The reversal of 21226246 is 64262212.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21226246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21226241) 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 as a sum of consecutive naturals, namely, 5306560 + ... + 5306563.

It is an arithmetic number, because the mean of its divisors is an integer number (7959843).

Almost surely, 2^21226246 is an apocalyptic number.

21226246 is a deficient number, since it is larger than the sum of its proper divisors (10613126).

21226246 is a wasteful number, since it uses less digits than its factorization.

21226246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10613125.

The product of its digits is 2304, while the sum is 25.

The square root of 21226246 is about 4607.1950251753. The cubic root of 21226246 is about 276.8796672657.

Adding to 21226246 its reverse (64262212), we get a palindrome (85488458).

The spelling of 21226246 in words is "twenty-one million, two hundred twenty-six thousand, two hundred forty-six".