21100330789 has 2 divisors, whose sum is σ = 21100330790. Its totient is φ = 21100330788.

The previous prime is 21100330723. The next prime is 21100330819. The reversal of 21100330789 is 98703300112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19334902500 + 1765428289 = 139050^2 + 42017^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100330789 - 2¹¹ = 21100328741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100331789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550165394 + 10550165395.

It is an arithmetic number, because the mean of its divisors is an integer number (10550165395).

Almost surely, 2^21100330789 is an apocalyptic number.

It is an amenable number.

21100330789 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100330789 is an equidigital number, since it uses as much as digits as its factorization.

21100330789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The spelling of 21100330789 in words is "twenty-one billion, one hundred million, three hundred thirty thousand, seven hundred eighty-nine".