21223147 has 8 divisors (see below), whose sum is σ = 23188032. Its totient is φ = 19264200.

The previous prime is 21223141. The next prime is 21223159. The reversal of 21223147 is 74132212.

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

It is a cyclic number.

It is not a de Polignac number, because 21223147 - 2¹¹ = 21221099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21223141) 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, 9688 + ... + 11674.

It is an arithmetic number, because the mean of its divisors is an integer number (2898504).

Almost surely, 2^21223147 is an apocalyptic number.

21223147 is a deficient number, since it is larger than the sum of its proper divisors (1964885).

21223147 is a wasteful number, since it uses less digits than its factorization.

21223147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2969.

The product of its digits is 672, while the sum is 22.

The square root of 21223147 is about 4606.8586911257. The cubic root of 21223147 is about 276.8661919382.

Adding to 21223147 its reverse (74132212), we get a palindrome (95355359).

The spelling of 21223147 in words is "twenty-one million, two hundred twenty-three thousand, one hundred forty-seven".