20121001177 has 2 divisors, whose sum is σ = 20121001178. Its totient is φ = 20121001176.

The previous prime is 20121001157. The next prime is 20121001181. The reversal of 20121001177 is 77110012102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15155825881 + 4965175296 = 123109^2 + 70464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121001177 is a prime.

It is not a weakly prime, because it can be changed into another prime (20121001157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060500588 + 10060500589.

It is an arithmetic number, because the mean of its divisors is an integer number (10060500589).

Almost surely, 2^20121001177 is an apocalyptic number.

It is an amenable number.

20121001177 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121001177 is an equidigital number, since it uses as much as digits as its factorization.

20121001177 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 196, while the sum is 22.

Adding to 20121001177 its reverse (77110012102), we get a palindrome (97231013279).

The spelling of 20121001177 in words is "twenty billion, one hundred twenty-one million, one thousand, one hundred seventy-seven".