21320758 has 8 divisors (see below), whose sum is σ = 32017752. Its totient is φ = 10648176.

The previous prime is 21320749. The next prime is 21320801. The reversal of 21320758 is 85702312.

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

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 3735 + ... + 7522.

It is an arithmetic number, because the mean of its divisors is an integer number (4002219).

Almost surely, 2^21320758 is an apocalyptic number.

21320758 is a deficient number, since it is larger than the sum of its proper divisors (10696994).

21320758 is a wasteful number, since it uses less digits than its factorization.

21320758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12206.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 21320758 is about 4617.4406330780. The cubic root of 21320758 is about 277.2900037218.

The spelling of 21320758 in words is "twenty-one million, three hundred twenty thousand, seven hundred fifty-eight".