21111011329 has 2 divisors, whose sum is σ = 21111011330. Its totient is φ = 21111011328.

The previous prime is 21111011287. The next prime is 21111011399. The reversal of 21111011329 is 92311011112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19117210225 + 1993801104 = 138265^2 + 44652^2 .

It is a cyclic number.

It is not a de Polignac number, because 21111011329 - 2¹¹ = 21111009281 is a prime.

It is not a weakly prime, because it can be changed into another prime (21111011399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555505664 + 10555505665.

It is an arithmetic number, because the mean of its divisors is an integer number (10555505665).

Almost surely, 2^21111011329 is an apocalyptic number.

It is an amenable number.

21111011329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111011329 is an equidigital number, since it uses as much as digits as its factorization.

21111011329 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 22.

The spelling of 21111011329 in words is "twenty-one billion, one hundred eleven million, eleven thousand, three hundred twenty-nine".