21960730 has 32 divisors (see below), whose sum is σ = 43400448. Its totient is φ = 7934400.

The previous prime is 21960727. The next prime is 21960767. The reversal of 21960730 is 3706912.

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 15 ways as a sum of consecutive naturals, for example, 19359 + ... + 20461.

It is an arithmetic number, because the mean of its divisors is an integer number (1356264).

Almost surely, 2^21960730 is an apocalyptic number.

21960730 is a deficient number, since it is larger than the sum of its proper divisors (21439718).

21960730 is a wasteful number, since it uses less digits than its factorization.

21960730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 21960730 is about 4686.2276939987. The cubic root of 21960730 is about 280.0371124277.

The spelling of 21960730 in words is "twenty-one million, nine hundred sixty thousand, seven hundred thirty".