21612335843 has 8 divisors (see below), whose sum is σ = 25118453760. Its totient is φ = 18210878280.

The previous prime is 21612335837. The next prime is 21612335867. The reversal of 21612335843 is 34853321612.

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

It is not a de Polignac number, because 21612335843 - 2¹⁰ = 21612334819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21612335797 and 21612335806.

It is not an unprimeable number, because it can be changed into a prime (21612335743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26164643 + ... + 26165468.

It is an arithmetic number, because the mean of its divisors is an integer number (3139806720).

Almost surely, 2^21612335843 is an apocalyptic number.

21612335843 is a deficient number, since it is larger than the sum of its proper divisors (3506117917).

21612335843 is an equidigital number, since it uses as much as digits as its factorization.

21612335843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52330177.

The product of its digits is 103680, while the sum is 38.

The spelling of 21612335843 in words is "twenty-one billion, six hundred twelve million, three hundred thirty-five thousand, eight hundred forty-three".