21455450302445 has 16 divisors (see below), whose sum is σ = 25752798383040. Its totient is φ = 17160188769024.

The previous prime is 21455450302439. The next prime is 21455450302471. The reversal of 21455450302445 is 54420305455412.

It is a cyclic number.

It is not a de Polignac number, because 21455450302445 - 2¹² = 21455450298349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21455450302396 and 21455450302405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 451603382 + ... + 451650888.

It is an arithmetic number, because the mean of its divisors is an integer number (1609549898940).

Almost surely, 2^{21455450302445} is an apocalyptic number.

It is an amenable number.

21455450302445 is a deficient number, since it is larger than the sum of its proper divisors (4297348080595).

21455450302445 is a wasteful number, since it uses less digits than its factorization.

21455450302445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67564.

The product of its (nonzero) digits is 1920000, while the sum is 44.

Adding to 21455450302445 its reverse (54420305455412), we get a palindrome (75875755757857).

The spelling of 21455450302445 in words is "twenty-one trillion, four hundred fifty-five billion, four hundred fifty million, three hundred two thousand, four hundred forty-five".