21455450302345 has 4 divisors (see below), whose sum is σ = 25746540362820. Its totient is φ = 17164360241872.

The previous prime is 21455450302331. The next prime is 21455450302357. The reversal of 21455450302345 is 54320305455412.

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 2439056815504 + 19016393486841 = 1561748^2 + 4360779^2 .

It is a cyclic number.

It is not a de Polignac number, because 21455450302345 - 2²¹ = 21455448205193 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2145545030230 + ... + 2145545030239.

It is an arithmetic number, because the mean of its divisors is an integer number (6436635090705).

Almost surely, 2^{21455450302345} is an apocalyptic number.

It is an amenable number.

21455450302345 is a deficient number, since it is larger than the sum of its proper divisors (4291090060475).

21455450302345 is an equidigital number, since it uses as much as digits as its factorization.

21455450302345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4291090060474.

The product of its (nonzero) digits is 1440000, while the sum is 43.

Adding to 21455450302345 its reverse (54320305455412), we get a palindrome (75775755757757).

The spelling of 21455450302345 in words is "twenty-one trillion, four hundred fifty-five billion, four hundred fifty million, three hundred two thousand, three hundred forty-five".