20110021020077 has 2 divisors, whose sum is σ = 20110021020078. Its totient is φ = 20110021020076.

The previous prime is 20110021020071. The next prime is 20110021020139. The reversal of 20110021020077 is 77002012001102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14938062670441 + 5171958349636 = 3864979^2 + 2274194^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20110021020077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20110021020071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055010510038 + 10055010510039.

It is an arithmetic number, because the mean of its divisors is an integer number (10055010510039).

Almost surely, 2^{20110021020077} is an apocalyptic number.

It is an amenable number.

20110021020077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20110021020077 is an equidigital number, since it uses as much as digits as its factorization.

20110021020077 is an odious number, because the sum of its binary digits is odd.

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

Adding to 20110021020077 its reverse (77002012001102), we get a palindrome (97112033021179).

The spelling of 20110021020077 in words is "twenty trillion, one hundred ten billion, twenty-one million, twenty thousand, seventy-seven".