2043555821971 has 4 divisors (see below), whose sum is σ = 2046075620344. Its totient is φ = 2041036023600.

The previous prime is 2043555821959. The next prime is 2043555821999. The reversal of 2043555821971 is 1791285553402.

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 2043555821971 - 2¹¹ = 2043555819923 is a prime.

It is a super-2 number, since 2×2043555821971² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2043555821171) 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, 1259897970 + ... + 1259899591.

It is an arithmetic number, because the mean of its divisors is an integer number (511518905086).

Almost surely, 2^{2043555821971} is an apocalyptic number.

2043555821971 is a deficient number, since it is larger than the sum of its proper divisors (2519798373).

2043555821971 is an equidigital number, since it uses as much as digits as its factorization.

2043555821971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2519798372.

The product of its (nonzero) digits is 3024000, while the sum is 52.

It can be divided in two parts, 20435558 and 21971, that added together give a square (20457529 = 4523²).

The spelling of 2043555821971 in words is "two trillion, forty-three billion, five hundred fifty-five million, eight hundred twenty-one thousand, nine hundred seventy-one".