21346730 has 32 divisors (see below), whose sum is σ = 40953600. Its totient is φ = 7983360.

The previous prime is 21346711. The next prime is 21346751. The reversal of 21346730 is 3764312.

It is a self number, because there is not a number n which added to its sum of digits gives 21346730.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 33515 + ... + 34145.

It is an arithmetic number, because the mean of its divisors is an integer number (1279800).

Almost surely, 2^21346730 is an apocalyptic number.

21346730 is a deficient number, since it is larger than the sum of its proper divisors (19606870).

21346730 is a wasteful number, since it uses less digits than its factorization.

21346730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854.

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

The square root of 21346730 is about 4620.2521576208. The cubic root of 21346730 is about 277.4025521540.

The spelling of 21346730 in words is "twenty-one million, three hundred forty-six thousand, seven hundred thirty".