21434272 has 24 divisors (see below), whose sum is σ = 42351876. Its totient is φ = 10678272.

The previous prime is 21434269. The next prime is 21434279. The reversal of 21434272 is 27243412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13571856 + 7862416 = 3684^2 + 2804^2 .

It is not an unprimeable number, because it can be changed into a prime (21434279) 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 in 3 ways as a sum of consecutive naturals, for example, 9088 + ... + 11200.

Almost surely, 2^21434272 is an apocalyptic number.

It is an amenable number.

21434272 is a deficient number, since it is larger than the sum of its proper divisors (20917604).

21434272 is a wasteful number, since it uses less digits than its factorization.

21434272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2440 (or 2432 counting only the distinct ones).

The product of its digits is 2688, while the sum is 25.

The square root of 21434272 is about 4629.7161900056. The cubic root of 21434272 is about 277.7812401820.

Adding to 21434272 its reverse (27243412), we get a palindrome (48677684).

The spelling of 21434272 in words is "twenty-one million, four hundred thirty-four thousand, two hundred seventy-two".