21113161660667 has 2 divisors, whose sum is σ = 21113161660668. Its totient is φ = 21113161660666.

The previous prime is 21113161660631. The next prime is 21113161660681. The reversal of 21113161660667 is 76606616131112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21113161660667 - 2²⁰ = 21113160612091 is a prime.

It is not a weakly prime, because it can be changed into another prime (21113161660697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556580830333 + 10556580830334.

It is an arithmetic number, because the mean of its divisors is an integer number (10556580830334).

Almost surely, 2^{21113161660667} is an apocalyptic number.

21113161660667 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113161660667 is an equidigital number, since it uses as much as digits as its factorization.

21113161660667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 47.

Adding to 21113161660667 its reverse (76606616131112), we get a palindrome (97719777791779).

The spelling of 21113161660667 in words is "twenty-one trillion, one hundred thirteen billion, one hundred sixty-one million, six hundred sixty thousand, six hundred sixty-seven".