2116302461521 has 4 divisors (see below), whose sum is σ = 2189278408500. Its totient is φ = 2043326514544.

The previous prime is 2116302461489. The next prime is 2116302461531. The reversal of 2116302461521 is 1251642036112.

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 953140211521 + 1163162250000 = 976289^2 + 1078500^2 .

It is a cyclic number.

It is not a de Polignac number, because 2116302461521 - 2⁵ = 2116302461489 is a prime.

It is a super-2 number, since 2×2116302461521² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2116302461531) 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, 36487973446 + ... + 36487973503.

It is an arithmetic number, because the mean of its divisors is an integer number (547319602125).

Almost surely, 2^{2116302461521} is an apocalyptic number.

It is an amenable number.

2116302461521 is a deficient number, since it is larger than the sum of its proper divisors (72975946979).

2116302461521 is an equidigital number, since it uses as much as digits as its factorization.

2116302461521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72975946978.

The product of its (nonzero) digits is 17280, while the sum is 34.

Adding to 2116302461521 its reverse (1251642036112), we get a palindrome (3367944497633).

The spelling of 2116302461521 in words is "two trillion, one hundred sixteen billion, three hundred two million, four hundred sixty-one thousand, five hundred twenty-one".