21136226 has 8 divisors (see below), whose sum is σ = 31776300. Its totient is φ = 10544128.

The previous prime is 21136217. The next prime is 21136237. The reversal of 21136226 is 62263112.

It can be written as a sum of positive squares in 2 ways, for example, as 21114025 + 22201 = 4595^2 + 149^2 .

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

It is a Curzon number.

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, 10871 + ... + 12666.

Almost surely, 2^21136226 is an apocalyptic number.

21136226 is a deficient number, since it is larger than the sum of its proper divisors (10640074).

21136226 is a wasteful number, since it uses less digits than its factorization.

21136226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23988.

The product of its digits is 864, while the sum is 23.

The square root of 21136226 is about 4597.4151433169. The cubic root of 21136226 is about 276.4876992916.

Adding to 21136226 its reverse (62263112), we get a palindrome (83399338).

The spelling of 21136226 in words is "twenty-one million, one hundred thirty-six thousand, two hundred twenty-six".