21077036117 has 2 divisors, whose sum is σ = 21077036118. Its totient is φ = 21077036116.

The previous prime is 21077036089. The next prime is 21077036137. The reversal of 21077036117 is 71163077012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11708538436 + 9368497681 = 108206^2 + 96791^2 .

It is a cyclic number.

It is not a de Polignac number, because 21077036117 - 2¹⁸ = 21076773973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21077036137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10538518058 + 10538518059.

It is an arithmetic number, because the mean of its divisors is an integer number (10538518059).

Almost surely, 2^21077036117 is an apocalyptic number.

It is an amenable number.

21077036117 is a deficient number, since it is larger than the sum of its proper divisors (1).

21077036117 is an equidigital number, since it uses as much as digits as its factorization.

21077036117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12348, while the sum is 35.

The spelling of 21077036117 in words is "twenty-one billion, seventy-seven million, thirty-six thousand, one hundred seventeen".