21826856613 has 8 divisors (see below), whose sum is σ = 30634184800. Its totient is φ = 13785383088.

The previous prime is 21826856603. The next prime is 21826856633. The reversal of 21826856613 is 31665862812.

It is a happy number.

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

It is not a de Polignac number, because 21826856613 - 2²¹ = 21824759461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21826856603) 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 7 ways as a sum of consecutive naturals, for example, 191463598 + ... + 191463711.

It is an arithmetic number, because the mean of its divisors is an integer number (3829273100).

Almost surely, 2^21826856613 is an apocalyptic number.

It is an amenable number.

21826856613 is a deficient number, since it is larger than the sum of its proper divisors (8807328187).

21826856613 is a wasteful number, since it uses less digits than its factorization.

21826856613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382927331.

The product of its digits is 829440, while the sum is 48.

The spelling of 21826856613 in words is "twenty-one billion, eight hundred twenty-six million, eight hundred fifty-six thousand, six hundred thirteen".