21100121134177 has 2 divisors, whose sum is σ = 21100121134178. Its totient is φ = 21100121134176.

The previous prime is 21100121134171. The next prime is 21100121134243. The reversal of 21100121134177 is 77143112100112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15132341180961 + 5967779953216 = 3890031^2 + 2442904^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21100121134177 is a prime.

It is a super-2 number, since 2×21100121134177² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21100121134171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550060567088 + 10550060567089.

It is an arithmetic number, because the mean of its divisors is an integer number (10550060567089).

Almost surely, 2^{21100121134177} is an apocalyptic number.

It is an amenable number.

21100121134177 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100121134177 is an equidigital number, since it uses as much as digits as its factorization.

21100121134177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 31.

Adding to 21100121134177 its reverse (77143112100112), we get a palindrome (98243233234289).

The spelling of 21100121134177 in words is "twenty-one trillion, one hundred billion, one hundred twenty-one million, one hundred thirty-four thousand, one hundred seventy-seven".