21582746107 has 4 divisors (see below), whose sum is σ = 23242957360. Its totient is φ = 19922534856.

The previous prime is 21582746093. The next prime is 21582746137. The reversal of 21582746107 is 70164728512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21582746107 - 2²³ = 21574357499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21582746137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 830105607 + ... + 830105632.

It is an arithmetic number, because the mean of its divisors is an integer number (5810739340).

Almost surely, 2^21582746107 is an apocalyptic number.

21582746107 is a deficient number, since it is larger than the sum of its proper divisors (1660211253).

21582746107 is a wasteful number, since it uses less digits than its factorization.

21582746107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660211252.

The product of its (nonzero) digits is 188160, while the sum is 43.

The spelling of 21582746107 in words is "twenty-one billion, five hundred eighty-two million, seven hundred forty-six thousand, one hundred seven".