21828836965 has 8 divisors (see below), whose sum is σ = 28209574008. Its totient is φ = 16119756480.

The previous prime is 21828836957. The next prime is 21828836971. The reversal of 21828836965 is 56963882812.

It can be written as a sum of positive squares in 4 ways, for example, as 147452449 + 21681384516 = 12143^2 + 147246^2 .

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

It is not a de Polignac number, because 21828836965 - 2³ = 21828836957 is a prime.

It is a super-2 number, since 2×21828836965² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

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, 167914066 + ... + 167914195.

It is an arithmetic number, because the mean of its divisors is an integer number (3526196751).

Almost surely, 2^21828836965 is an apocalyptic number.

It is an amenable number.

21828836965 is a deficient number, since it is larger than the sum of its proper divisors (6380737043).

21828836965 is a wasteful number, since it uses less digits than its factorization.

21828836965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335828279.

The product of its digits is 9953280, while the sum is 58.

The spelling of 21828836965 in words is "twenty-one billion, eight hundred twenty-eight million, eight hundred thirty-six thousand, nine hundred sixty-five".