21123332101 has 2 divisors, whose sum is σ = 21123332102. Its totient is φ = 21123332100.

The previous prime is 21123332081. The next prime is 21123332117. The reversal of 21123332101 is 10123332112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18618329601 + 2505002500 = 136449^2 + 50050^2 .

It is a cyclic number.

It is not a de Polignac number, because 21123332101 - 2¹³ = 21123323909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21123332171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561666050 + 10561666051.

It is an arithmetic number, because the mean of its divisors is an integer number (10561666051).

Almost surely, 2^21123332101 is an apocalyptic number.

It is an amenable number.

21123332101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21123332101 is an equidigital number, since it uses as much as digits as its factorization.

21123332101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21123332101 its reverse (10123332112), we get a palindrome (31246664213).

The spelling of 21123332101 in words is "twenty-one billion, one hundred twenty-three million, three hundred thirty-two thousand, one hundred one".