21152111329 has 2 divisors, whose sum is σ = 21152111330. Its totient is φ = 21152111328.

The previous prime is 21152111327. The next prime is 21152111347. The reversal of 21152111329 is 92311125112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15133920400 + 6018190929 = 123020^2 + 77577^2 .

It is a cyclic number.

It is not a de Polignac number, because 21152111329 - 2¹ = 21152111327 is a prime.

Together with 21152111327, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21152111297 and 21152111306.

It is not a weakly prime, because it can be changed into another prime (21152111327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10576055664 + 10576055665.

It is an arithmetic number, because the mean of its divisors is an integer number (10576055665).

Almost surely, 2^21152111329 is an apocalyptic number.

It is an amenable number.

21152111329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21152111329 is an equidigital number, since it uses as much as digits as its factorization.

21152111329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 28.

The spelling of 21152111329 in words is "twenty-one billion, one hundred fifty-two million, one hundred eleven thousand, three hundred twenty-nine".