21034342415357 has 2 divisors, whose sum is σ = 21034342415358. Its totient is φ = 21034342415356.

The previous prime is 21034342415197. The next prime is 21034342415363. The reversal of 21034342415357 is 75351424343012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17865618447076 + 3168723968281 = 4226774^2 + 1780091^2 .

It is a cyclic number.

It is not a de Polignac number, because 21034342415357 - 2²⁰ = 21034341366781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21034342412357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10517171207678 + 10517171207679.

It is an arithmetic number, because the mean of its divisors is an integer number (10517171207679).

Almost surely, 2^{21034342415357} is an apocalyptic number.

It is an amenable number.

21034342415357 is a deficient number, since it is larger than the sum of its proper divisors (1).

21034342415357 is an equidigital number, since it uses as much as digits as its factorization.

21034342415357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 44.

Adding to 21034342415357 its reverse (75351424343012), we get a palindrome (96385766758369).

The spelling of 21034342415357 in words is "twenty-one trillion, thirty-four billion, three hundred forty-two million, four hundred fifteen thousand, three hundred fifty-seven".