20010012221077 has 2 divisors, whose sum is σ = 20010012221078. Its totient is φ = 20010012221076.

The previous prime is 20010012221063. The next prime is 20010012221161. The reversal of 20010012221077 is 77012221001002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17034390671076 + 2975621550001 = 4127274^2 + 1724999^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20010012221077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20010012221057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005006110538 + 10005006110539.

It is an arithmetic number, because the mean of its divisors is an integer number (10005006110539).

Almost surely, 2^{20010012221077} is an apocalyptic number.

It is an amenable number.

20010012221077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010012221077 is an equidigital number, since it uses as much as digits as its factorization.

20010012221077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 784, while the sum is 25.

Adding to 20010012221077 its reverse (77012221001002), we get a palindrome (97022233222079).

The spelling of 20010012221077 in words is "twenty trillion, ten billion, twelve million, two hundred twenty-one thousand, seventy-seven".