20212102136477 has 2 divisors, whose sum is σ = 20212102136478. Its totient is φ = 20212102136476.

The previous prime is 20212102136441. The next prime is 20212102136497. The reversal of 20212102136477 is 77463120121202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12757569507076 + 7454532629401 = 3571774^2 + 2730299^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212102136477 - 2⁸ = 20212102136221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20212102136477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20212102136497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106051068238 + 10106051068239.

It is an arithmetic number, because the mean of its divisors is an integer number (10106051068239).

Almost surely, 2^{20212102136477} is an apocalyptic number.

It is an amenable number.

20212102136477 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212102136477 is an equidigital number, since it uses as much as digits as its factorization.

20212102136477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 38.

Adding to 20212102136477 its reverse (77463120121202), we get a palindrome (97675222257679).

The spelling of 20212102136477 in words is "twenty trillion, two hundred twelve billion, one hundred two million, one hundred thirty-six thousand, four hundred seventy-seven".