21310116776077 has 4 divisors (see below), whose sum is σ = 21659462952796. Its totient is φ = 20960770599360.

The previous prime is 21310116776071. The next prime is 21310116776083. The reversal of 21310116776077 is 77067761101312.

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

It is an interprime number because it is at equal distance from previous prime (21310116776071) and next prime (21310116776083).

It can be written as a sum of positive squares in 2 ways, for example, as 7572463779721 + 13737652996356 = 2751811^2 + 3706434^2 .

It is a cyclic number.

It is not a de Polignac number, because 21310116776077 - 2²⁷ = 21309982558349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21310116776077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310116776071) 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, 174673088268 + ... + 174673088389.

It is an arithmetic number, because the mean of its divisors is an integer number (5414865738199).

Almost surely, 2^{21310116776077} is an apocalyptic number.

It is an amenable number.

21310116776077 is a deficient number, since it is larger than the sum of its proper divisors (349346176719).

21310116776077 is an equidigital number, since it uses as much as digits as its factorization.

21310116776077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349346176718.

The product of its (nonzero) digits is 518616, while the sum is 49.

Adding to 21310116776077 its reverse (77067761101312), we get a palindrome (98377877877389).

The spelling of 21310116776077 in words is "twenty-one trillion, three hundred ten billion, one hundred sixteen million, seven hundred seventy-six thousand, seventy-seven".