21227450 has 12 divisors (see below), whose sum is σ = 39483150. Its totient is φ = 8490960.

The previous prime is 21227447. The next prime is 21227461. The reversal of 21227450 is 5472212.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 15062161 + 6165289 = 3881^2 + 2483^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 212225 + ... + 212324.

Almost surely, 2^21227450 is an apocalyptic number.

21227450 is a deficient number, since it is larger than the sum of its proper divisors (18255700).

21227450 is a wasteful number, since it uses less digits than its factorization.

21227450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424561 (or 424556 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 21227450 is about 4607.3256885096. The cubic root of 21227450 is about 276.8849022441.

Adding to 21227450 its reverse (5472212), we get a palindrome (26699662).

The spelling of 21227450 in words is "twenty-one million, two hundred twenty-seven thousand, four hundred fifty".