21463730 has 16 divisors (see below), whose sum is σ = 40668480. Its totient is φ = 8133552.

The previous prime is 21463721. The next prime is 21463759. The reversal of 21463730 is 3736412.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21463730.

It is an unprimeable number.

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, 56294 + ... + 56673.

It is an arithmetic number, because the mean of its divisors is an integer number (2541780).

Almost surely, 2^21463730 is an apocalyptic number.

21463730 is a deficient number, since it is larger than the sum of its proper divisors (19204750).

21463730 is a wasteful number, since it uses less digits than its factorization.

21463730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112993.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 21463730 is about 4632.8965021895. The cubic root of 21463730 is about 277.9084373167.

The spelling of 21463730 in words is "twenty-one million, four hundred sixty-three thousand, seven hundred thirty".