21463446 has 16 divisors (see below), whose sum is σ = 43308144. Its totient is φ = 7090944.

The previous prime is 21463427. The next prime is 21463447. The reversal of 21463446 is 64436412.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21463447) 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 7 ways as a sum of consecutive naturals, for example, 15151 + ... + 16506.

It is an arithmetic number, because the mean of its divisors is an integer number (2706759).

Almost surely, 2^21463446 is an apocalyptic number.

21463446 is an abundant number, since it is smaller than the sum of its proper divisors (21844698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21463446 is a wasteful number, since it uses less digits than its factorization.

21463446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31775.

The product of its digits is 13824, while the sum is 30.

The square root of 21463446 is about 4632.8658517164. The cubic root of 21463446 is about 277.9072115846.

Adding to 21463446 its reverse (64436412), we get a palindrome (85899858).

The spelling of 21463446 in words is "twenty-one million, four hundred sixty-three thousand, four hundred forty-six".