2124846705721 has 4 divisors (see below), whose sum is σ = 2141577782272. Its totient is φ = 2108115629172.

The previous prime is 2124846705649. The next prime is 2124846705731. The reversal of 2124846705721 is 1275076484212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2124846705721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2124846705731) 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, 8365538085 + ... + 8365538338.

It is an arithmetic number, because the mean of its divisors is an integer number (535394445568).

Almost surely, 2^{2124846705721} is an apocalyptic number.

It is an amenable number.

2124846705721 is a deficient number, since it is larger than the sum of its proper divisors (16731076551).

2124846705721 is a wasteful number, since it uses less digits than its factorization.

2124846705721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16731076550.

The product of its (nonzero) digits is 1505280, while the sum is 49.

The spelling of 2124846705721 in words is "two trillion, one hundred twenty-four billion, eight hundred forty-six million, seven hundred five thousand, seven hundred twenty-one".