21068771843 has 8 divisors (see below), whose sum is σ = 24231964512. Its totient is φ = 17943921216.

The previous prime is 21068771837. The next prime is 21068771863. The reversal of 21068771843 is 34817786012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21068771843 - 2¹⁸ = 21068509699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21068771863) 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, 9584330 + ... + 9586527.

It is an arithmetic number, because the mean of its divisors is an integer number (3028995564).

Almost surely, 2^21068771843 is an apocalyptic number.

21068771843 is a deficient number, since it is larger than the sum of its proper divisors (3163192669).

21068771843 is a wasteful number, since it uses less digits than its factorization.

21068771843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19171021.

The product of its (nonzero) digits is 451584, while the sum is 47.

The spelling of 21068771843 in words is "twenty-one billion, sixty-eight million, seven hundred seventy-one thousand, eight hundred forty-three".