2101640533543 has 2 divisors, whose sum is σ = 2101640533544. Its totient is φ = 2101640533542.

The previous prime is 2101640533511. The next prime is 2101640533547. The reversal of 2101640533543 is 3453350461012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2101640533543 - 2⁵ = 2101640533511 is a prime.

It is a super-3 number, since 3×2101640533543³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101640533547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050820266771 + 1050820266772.

It is an arithmetic number, because the mean of its divisors is an integer number (1050820266772).

Almost surely, 2^{2101640533543} is an apocalyptic number.

2101640533543 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101640533543 is an equidigital number, since it uses as much as digits as its factorization.

2101640533543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 37.

Adding to 2101640533543 its reverse (3453350461012), we get a palindrome (5554990994555).

The spelling of 2101640533543 in words is "two trillion, one hundred one billion, six hundred forty million, five hundred thirty-three thousand, five hundred forty-three".