21152543114345 has 4 divisors (see below), whose sum is σ = 25383051737220. Its totient is φ = 16922034491472.

The previous prime is 21152543114327. The next prime is 21152543114347. The reversal of 21152543114345 is 54341134525112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10161832944169 + 10990710170176 = 3187763^2 + 3315224^2 .

It is a cyclic number.

It is not a de Polignac number, because 21152543114345 - 2²⁶ = 21152476005481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21152543114347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2115254311430 + ... + 2115254311439.

It is an arithmetic number, because the mean of its divisors is an integer number (6345762934305).

Almost surely, 2^{21152543114345} is an apocalyptic number.

It is an amenable number.

21152543114345 is a deficient number, since it is larger than the sum of its proper divisors (4230508622875).

21152543114345 is an equidigital number, since it uses as much as digits as its factorization.

21152543114345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4230508622874.

The product of its digits is 288000, while the sum is 41.

Adding to 21152543114345 its reverse (54341134525112), we get a palindrome (75493677639457).

The spelling of 21152543114345 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred forty-three million, one hundred fourteen thousand, three hundred forty-five".