21116605652293 has 2 divisors, whose sum is σ = 21116605652294. Its totient is φ = 21116605652292.

The previous prime is 21116605652287. The next prime is 21116605652327. The reversal of 21116605652293 is 39225650661112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21116065229284 + 540423009 = 4595222^2 + 23247^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21116605652293 is a prime.

It is a super-2 number, since 2×21116605652293² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21116605650293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10558302826146 + 10558302826147.

It is an arithmetic number, because the mean of its divisors is an integer number (10558302826147).

Almost surely, 2^{21116605652293} is an apocalyptic number.

It is an amenable number.

21116605652293 is a deficient number, since it is larger than the sum of its proper divisors (1).

21116605652293 is an equidigital number, since it uses as much as digits as its factorization.

21116605652293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The spelling of 21116605652293 in words is "twenty-one trillion, one hundred sixteen billion, six hundred five million, six hundred fifty-two thousand, two hundred ninety-three".