21012222002077 has 2 divisors, whose sum is σ = 21012222002078. Its totient is φ = 21012222002076.

The previous prime is 21012222002069. The next prime is 21012222002087. The reversal of 21012222002077 is 77020022221012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19934921241316 + 1077300760761 = 4464854^2 + 1037931^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012222002077 - 2³ = 21012222002069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012222002087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506111001038 + 10506111001039.

It is an arithmetic number, because the mean of its divisors is an integer number (10506111001039).

Almost surely, 2^{21012222002077} is an apocalyptic number.

It is an amenable number.

21012222002077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012222002077 is an equidigital number, since it uses as much as digits as its factorization.

21012222002077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3136, while the sum is 28.

Adding to 21012222002077 its reverse (77020022221012), we get a palindrome (98032244223089).

The spelling of 21012222002077 in words is "twenty-one trillion, twelve billion, two hundred twenty-two million, two thousand, seventy-seven".