21227246 has 16 divisors (see below), whose sum is σ = 33188400. Its totient is φ = 10170048.

The previous prime is 21227243. The next prime is 21227249. The reversal of 21227246 is 64272212.

It is an interprime number because it is at equal distance from previous prime (21227243) and next prime (21227249).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21227243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6746 + ... + 9378.

It is an arithmetic number, because the mean of its divisors is an integer number (2074275).

Almost surely, 2^21227246 is an apocalyptic number.

21227246 is a deficient number, since it is larger than the sum of its proper divisors (11961154).

21227246 is a wasteful number, since it uses less digits than its factorization.

21227246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2803.

The product of its digits is 2688, while the sum is 26.

The square root of 21227246 is about 4607.3035498000. The cubic root of 21227246 is about 276.8840152683.

Adding to 21227246 its reverse (64272212), we get a palindrome (85499458).

The spelling of 21227246 in words is "twenty-one million, two hundred twenty-seven thousand, two hundred forty-six".