21020333101 has 2 divisors, whose sum is σ = 21020333102. Its totient is φ = 21020333100.

The previous prime is 21020333071. The next prime is 21020333119. The reversal of 21020333101 is 10133302012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16413453225 + 4606879876 = 128115^2 + 67874^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020333101 - 2¹³ = 21020324909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020333161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510166550 + 10510166551.

It is an arithmetic number, because the mean of its divisors is an integer number (10510166551).

Almost surely, 2^21020333101 is an apocalyptic number.

It is an amenable number.

21020333101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020333101 is an equidigital number, since it uses as much as digits as its factorization.

21020333101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21020333101 its reverse (10133302012), we get a palindrome (31153635113).

The spelling of 21020333101 in words is "twenty-one billion, twenty million, three hundred thirty-three thousand, one hundred one".