1200021020101 has 2 divisors, whose sum is σ = 1200021020102. Its totient is φ = 1200021020100.

The previous prime is 1200021020071. The next prime is 1200021020119. The reversal of 1200021020101 is 1010201200021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1125095097025 + 74925923076 = 1060705^2 + 273726^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200021020101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200021020801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600010510050 + 600010510051.

It is an arithmetic number, because the mean of its divisors is an integer number (600010510051).

Almost surely, 2^{1200021020101} is an apocalyptic number.

It is an amenable number.

1200021020101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200021020101 is an equidigital number, since it uses as much as digits as its factorization.

1200021020101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1200021020101 its reverse (1010201200021), we get a palindrome (2210222220122).

The spelling of 1200021020101 in words is "one trillion, two hundred billion, twenty-one million, twenty thousand, one hundred one".