21020201000077 has 2 divisors, whose sum is σ = 21020201000078. Its totient is φ = 21020201000076.

The previous prime is 21020201000059. The next prime is 21020201000129. The reversal of 21020201000077 is 77000010202012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12292779283236 + 8727421716841 = 3506106^2 + 2954221^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020201000077 - 2²⁷ = 21020066782349 is a prime.

It is a super-2 number, since 2×21020201000077² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020201000177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510100500038 + 10510100500039.

It is an arithmetic number, because the mean of its divisors is an integer number (10510100500039).

Almost surely, 2^{21020201000077} is an apocalyptic number.

It is an amenable number.

21020201000077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020201000077 is an equidigital number, since it uses as much as digits as its factorization.

21020201000077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 392, while the sum is 22.

Adding to 21020201000077 its reverse (77000010202012), we get a palindrome (98020211202089).

The spelling of 21020201000077 in words is "twenty-one trillion, twenty billion, two hundred one million, seventy-seven", and thus it is an aban number.