2116624031261 has 4 divisors (see below), whose sum is σ = 2116740009852. Its totient is φ = 2116508052672.

The previous prime is 2116624031251. The next prime is 2116624031311. The reversal of 2116624031261 is 1621304266112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 386254792036 + 1730369239225 = 621494^2 + 1315435^2 .

It is a cyclic number.

It is not a de Polignac number, because 2116624031261 - 2²² = 2116619836957 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 (2116624031231) 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, 57961916 + ... + 57998421.

It is an arithmetic number, because the mean of its divisors is an integer number (529185002463).

Almost surely, 2^{2116624031261} is an apocalyptic number.

It is an amenable number.

2116624031261 is a deficient number, since it is larger than the sum of its proper divisors (115978591).

2116624031261 is a wasteful number, since it uses less digits than its factorization.

2116624031261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115978590.

The product of its (nonzero) digits is 20736, while the sum is 35.

Adding to 2116624031261 its reverse (1621304266112), we get a palindrome (3737928297373).

The spelling of 2116624031261 in words is "two trillion, one hundred sixteen billion, six hundred twenty-four million, thirty-one thousand, two hundred sixty-one".