21600730 has 16 divisors (see below), whose sum is σ = 39709440. Its totient is φ = 8456272.

The previous prime is 21600673. The next prime is 21600743. The reversal of 21600730 is 3700612.

It is a junction number, because it is equal to n+sod(n) for n = 21600698 and 21600707.

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 7 ways as a sum of consecutive naturals, for example, 22510 + ... + 23449.

It is an arithmetic number, because the mean of its divisors is an integer number (2481840).

Almost surely, 2^21600730 is an apocalyptic number.

21600730 is a deficient number, since it is larger than the sum of its proper divisors (18108710).

21600730 is a wasteful number, since it uses less digits than its factorization.

21600730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46013.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 21600730 is about 4647.6585502810. The cubic root of 21600730 is about 278.4984673517.

The spelling of 21600730 in words is "twenty-one million, six hundred thousand, seven hundred thirty".