21285652758 has 16 divisors (see below), whose sum is σ = 42589580976. Its totient is φ = 7092171680.

The previous prime is 21285652733. The next prime is 21285652771. The reversal of 21285652758 is 85725658212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21285652758.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 746313 + ... + 774308.

It is an arithmetic number, because the mean of its divisors is an integer number (2661848811).

Almost surely, 2^21285652758 is an apocalyptic number.

21285652758 is an abundant number, since it is smaller than the sum of its proper divisors (21303928218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21285652758 is a wasteful number, since it uses less digits than its factorization.

21285652758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1522959.

The product of its digits is 2688000, while the sum is 51.

The spelling of 21285652758 in words is "twenty-one billion, two hundred eighty-five million, six hundred fifty-two thousand, seven hundred fifty-eight".