10202120840077 has 2 divisors, whose sum is σ = 10202120840078. Its totient is φ = 10202120840076.

The previous prime is 10202120840069. The next prime is 10202120840089. The reversal of 10202120840077 is 77004802120201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9308729142441 + 893391697636 = 3051021^2 + 945194^2 .

It is a cyclic number.

It is not a de Polignac number, because 10202120840077 - 2³ = 10202120840069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10202120840377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5101060420038 + 5101060420039.

It is an arithmetic number, because the mean of its divisors is an integer number (5101060420039).

Almost surely, 2^{10202120840077} is an apocalyptic number.

It is an amenable number.

10202120840077 is a deficient number, since it is larger than the sum of its proper divisors (1).

10202120840077 is an equidigital number, since it uses as much as digits as its factorization.

10202120840077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12544, while the sum is 34.

Adding to 10202120840077 its reverse (77004802120201), we get a palindrome (87206922960278).

The spelling of 10202120840077 in words is "ten trillion, two hundred two billion, one hundred twenty million, eight hundred forty thousand, seventy-seven".