21463930 has 8 divisors (see below), whose sum is σ = 38635092. Its totient is φ = 8585568.

The previous prime is 21463921. The next prime is 21463931. The reversal of 21463930 is 3936412.

It can be written as a sum of positive squares in 2 ways, for example, as 18481401 + 2982529 = 4299^2 + 1727^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21463931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1073187 + ... + 1073206.

Almost surely, 2^21463930 is an apocalyptic number.

21463930 is a deficient number, since it is larger than the sum of its proper divisors (17171162).

21463930 is a wasteful number, since it uses less digits than its factorization.

21463930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2146400.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 21463930 is about 4632.9180869081. The cubic root of 21463930 is about 277.9093005017.

The spelling of 21463930 in words is "twenty-one million, four hundred sixty-three thousand, nine hundred thirty".