20121120077 has 2 divisors, whose sum is σ = 20121120078. Its totient is φ = 20121120076.

The previous prime is 20121120007. The next prime is 20121120079. The reversal of 20121120077 is 77002112102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11017861156 + 9103258921 = 104966^2 + 95411^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121120077 - 2¹² = 20121115981 is a prime.

Together with 20121120079, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121120079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060560038 + 10060560039.

It is an arithmetic number, because the mean of its divisors is an integer number (10060560039).

Almost surely, 2^20121120077 is an apocalyptic number.

It is an amenable number.

20121120077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121120077 is an equidigital number, since it uses as much as digits as its factorization.

20121120077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 392, while the sum is 23.

Adding to 20121120077 its reverse (77002112102), we get a palindrome (97123232179).

The spelling of 20121120077 in words is "twenty billion, one hundred twenty-one million, one hundred twenty thousand, seventy-seven".