20001210120077 has 2 divisors, whose sum is σ = 20001210120078. Its totient is φ = 20001210120076.

The previous prime is 20001210119999. The next prime is 20001210120079. The reversal of 20001210120077 is 77002101210002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19390821057001 + 610389063076 = 4403501^2 + 781274^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001210120077 - 2¹² = 20001210115981 is a prime.

Together with 20001210120079, 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 (20001210120079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000605060038 + 10000605060039.

It is an arithmetic number, because the mean of its divisors is an integer number (10000605060039).

Almost surely, 2^{20001210120077} is an apocalyptic number.

It is an amenable number.

20001210120077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001210120077 is an equidigital number, since it uses as much as digits as its factorization.

20001210120077 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 20001210120077 its reverse (77002101210002), we get a palindrome (97003311330079).

The spelling of 20001210120077 in words is "twenty trillion, one billion, two hundred ten million, one hundred twenty thousand, seventy-seven".