21275758 has 16 divisors (see below), whose sum is σ = 36537984. Its totient is φ = 9101880.

The previous prime is 21275747. The next prime is 21275809. The reversal of 21275758 is 85757212.

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 7 ways as a sum of consecutive naturals, for example, 10053 + ... + 11983.

It is an arithmetic number, because the mean of its divisors is an integer number (2283624).

Almost surely, 2^21275758 is an apocalyptic number.

21275758 is a deficient number, since it is larger than the sum of its proper divisors (15262226).

21275758 is a wasteful number, since it uses less digits than its factorization.

21275758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2727.

The product of its digits is 39200, while the sum is 37.

The square root of 21275758 is about 4612.5652298911. The cubic root of 21275758 is about 277.0947817809.

The spelling of 21275758 in words is "twenty-one million, two hundred seventy-five thousand, seven hundred fifty-eight".