2101254311543 has 4 divisors (see below), whose sum is σ = 2106547143960. Its totient is φ = 2095961479128.

The previous prime is 2101254311489. The next prime is 2101254311561. The reversal of 2101254311543 is 3451134521012.

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 2101254311543 - 2²⁰ = 2101253262967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101254316543) 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, 2646415613 + ... + 2646416406.

It is an arithmetic number, because the mean of its divisors is an integer number (526636785990).

Almost surely, 2^{2101254311543} is an apocalyptic number.

2101254311543 is a deficient number, since it is larger than the sum of its proper divisors (5292832417).

2101254311543 is an equidigital number, since it uses as much as digits as its factorization.

2101254311543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5292832416.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 2101254311543 its reverse (3451134521012), we get a palindrome (5552388832555).

The spelling of 2101254311543 in words is "two trillion, one hundred one billion, two hundred fifty-four million, three hundred eleven thousand, five hundred forty-three".