2123720706242 has 8 divisors (see below), whose sum is σ = 3372968180556. Its totient is φ = 999397979392.

The previous prime is 2123720706193. The next prime is 2123720706251. The reversal of 2123720706242 is 2426070273212.

It can be written as a sum of positive squares in 2 ways, for example, as 2055097140721 + 68623565521 = 1433561^2 + 261961^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 2123720706196 and 2123720706205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31231186823 + ... + 31231186890.

Almost surely, 2^{2123720706242} is an apocalyptic number.

2123720706242 is a deficient number, since it is larger than the sum of its proper divisors (1249247474314).

2123720706242 is a wasteful number, since it uses less digits than its factorization.

2123720706242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62462373732.

The product of its (nonzero) digits is 112896, while the sum is 38.

Adding to 2123720706242 its reverse (2426070273212), we get a palindrome (4549790979454).

The spelling of 2123720706242 in words is "two trillion, one hundred twenty-three billion, seven hundred twenty million, seven hundred six thousand, two hundred forty-two".