21000302101 has 2 divisors, whose sum is σ = 21000302102. Its totient is φ = 21000302100.

The previous prime is 21000302087. The next prime is 21000302129. The reversal of 21000302101 is 10120300012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18029507076 + 2970795025 = 134274^2 + 54505^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000302101 - 2³³ = 12410367509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000302161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500151050 + 10500151051.

It is an arithmetic number, because the mean of its divisors is an integer number (10500151051).

Almost surely, 2^21000302101 is an apocalyptic number.

It is an amenable number.

21000302101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000302101 is an equidigital number, since it uses as much as digits as its factorization.

21000302101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 21000302101 its reverse (10120300012), we get a palindrome (31120602113).

The spelling of 21000302101 in words is "twenty-one billion, three hundred two thousand, one hundred one".