21034342415245 has 8 divisors (see below), whose sum is σ = 25241320348920. Its totient is φ = 16827400965120.

The previous prime is 21034342415197. The next prime is 21034342415357. The reversal of 21034342415245 is 54251424343012.

It can be written as a sum of positive squares in 4 ways, for example, as 315768696489 + 20718573718756 = 561933^2 + 4551766^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21034342415245 - 2¹³ = 21034342407053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21034342415198 and 21034342415207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7836036 + ... + 10172125.

It is an arithmetic number, because the mean of its divisors is an integer number (3155165043615).

Almost surely, 2^{21034342415245} is an apocalyptic number.

It is an amenable number.

21034342415245 is a deficient number, since it is larger than the sum of its proper divisors (4206977933675).

21034342415245 is a wasteful number, since it uses less digits than its factorization.

21034342415245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18241775.

The product of its (nonzero) digits is 460800, while the sum is 40.

Adding to 21034342415245 its reverse (54251424343012), we get a palindrome (75285766758257).

The spelling of 21034342415245 in words is "twenty-one trillion, thirty-four billion, three hundred forty-two million, four hundred fifteen thousand, two hundred forty-five".