21077327843 has 16 divisors (see below), whose sum is σ = 25229395296. Its totient is φ = 17353539840.

The previous prime is 21077327809. The next prime is 21077327849. The reversal of 21077327843 is 34872377012.

It is not a de Polignac number, because 21077327843 - 2¹⁰ = 21077326819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21077327794 and 21077327803.

It is not an unprimeable number, because it can be changed into a prime (21077327849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1382930 + ... + 1398087.

It is an arithmetic number, because the mean of its divisors is an integer number (1576837206).

Almost surely, 2^21077327843 is an apocalyptic number.

21077327843 is a deficient number, since it is larger than the sum of its proper divisors (4152067453).

21077327843 is a wasteful number, since it uses less digits than its factorization.

21077327843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2781094.

The product of its (nonzero) digits is 395136, while the sum is 44.

The spelling of 21077327843 in words is "twenty-one billion, seventy-seven million, three hundred twenty-seven thousand, eight hundred forty-three".