21677803243 has 4 divisors (see below), whose sum is σ = 21678320880. Its totient is φ = 21677285608.

The previous prime is 21677803229. The next prime is 21677803307. The reversal of 21677803243 is 34230877612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21677803243 - 2⁵ = 21677803211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21677803243.

It is not an unprimeable number, because it can be changed into a prime (21677803943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189880 + ... + 281797.

It is an arithmetic number, because the mean of its divisors is an integer number (5419580220).

Almost surely, 2^21677803243 is an apocalyptic number.

21677803243 is a deficient number, since it is larger than the sum of its proper divisors (517637).

21677803243 is an equidigital number, since it uses as much as digits as its factorization.

21677803243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517636.

The product of its (nonzero) digits is 338688, while the sum is 43.

The spelling of 21677803243 in words is "twenty-one billion, six hundred seventy-seven million, eight hundred three thousand, two hundred forty-three".