20121120220177 has 2 divisors, whose sum is σ = 20121120220178. Its totient is φ = 20121120220176.

The previous prime is 20121120220171. The next prime is 20121120220213. The reversal of 20121120220177 is 77102202112102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10862007611536 + 9259112608641 = 3295756^2 + 3042879^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121120220177 is a prime.

It is a super-2 number, since 2×20121120220177² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20121120220171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060560110088 + 10060560110089.

It is an arithmetic number, because the mean of its divisors is an integer number (10060560110089).

Almost surely, 2^{20121120220177} is an apocalyptic number.

It is an amenable number.

20121120220177 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121120220177 is an equidigital number, since it uses as much as digits as its factorization.

20121120220177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 28.

Adding to 20121120220177 its reverse (77102202112102), we get a palindrome (97223322332279).

The spelling of 20121120220177 in words is "twenty trillion, one hundred twenty-one billion, one hundred twenty million, two hundred twenty thousand, one hundred seventy-seven".