21231226 has 8 divisors (see below), whose sum is σ = 31960224. Its totient is φ = 10577820.

The previous prime is 21231173. The next prime is 21231241. The reversal of 21231226 is 62213212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18190 + ... + 19321.

It is an arithmetic number, because the mean of its divisors is an integer number (3995028).

Almost surely, 2^21231226 is an apocalyptic number.

21231226 is a deficient number, since it is larger than the sum of its proper divisors (10728998).

21231226 is a wasteful number, since it uses less digits than its factorization.

21231226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37796.

The product of its digits is 288, while the sum is 19.

The square root of 21231226 is about 4607.7354524755. The cubic root of 21231226 is about 276.9013189656.

Adding to 21231226 its reverse (62213212), we get a palindrome (83444438).

The spelling of 21231226 in words is "twenty-one million, two hundred thirty-one thousand, two hundred twenty-six".