20122100021077 has 2 divisors, whose sum is σ = 20122100021078. Its totient is φ = 20122100021076.

The previous prime is 20122100021069. The next prime is 20122100021083. The reversal of 20122100021077 is 77012000122102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15734558155761 + 4387541865316 = 3966681^2 + 2094646^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122100021077 - 2³ = 20122100021069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20122100021047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061050010538 + 10061050010539.

It is an arithmetic number, because the mean of its divisors is an integer number (10061050010539).

Almost surely, 2^{20122100021077} is an apocalyptic number.

It is an amenable number.

20122100021077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122100021077 is an equidigital number, since it uses as much as digits as its factorization.

20122100021077 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 20122100021077 its reverse (77012000122102), we get a palindrome (97134100143179).

The spelling of 20122100021077 in words is "twenty trillion, one hundred twenty-two billion, one hundred million, twenty-one thousand, seventy-seven".