20012021221177 has 2 divisors, whose sum is σ = 20012021221178. Its totient is φ = 20012021221176.

The previous prime is 20012021221139. The next prime is 20012021221261. The reversal of 20012021221177 is 77112212021002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11383579089936 + 8628442131241 = 3373956^2 + 2937421^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012021221177 - 2¹⁵ = 20012021188409 is a prime.

It is not a weakly prime, because it can be changed into another prime (20012021221277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006010610588 + 10006010610589.

It is an arithmetic number, because the mean of its divisors is an integer number (10006010610589).

Almost surely, 2^{20012021221177} is an apocalyptic number.

It is an amenable number.

20012021221177 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012021221177 is an equidigital number, since it uses as much as digits as its factorization.

20012021221177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 28.

Adding to 20012021221177 its reverse (77112212021002), we get a palindrome (97124233242179).

The spelling of 20012021221177 in words is "twenty trillion, twelve billion, twenty-one million, two hundred twenty-one thousand, one hundred seventy-seven".