21045878345425 has 12 divisors (see below), whose sum is σ = 26350257007360. Its totient is φ = 16673239541520.

The previous prime is 21045878345419. The next prime is 21045878345461. The reversal of 21045878345425 is 52454387854012.

It is not a de Polignac number, because 21045878345425 - 2³ = 21045878345417 is a prime.

It is a hoax number, since the sum of its digits (58) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21045878345425.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4086575745 + ... + 4086580894.

Almost surely, 2^{21045878345425} is an apocalyptic number.

21045878345425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21045878345425 is a deficient number, since it is larger than the sum of its proper divisors (5304378661935).

21045878345425 is a wasteful number, since it uses less digits than its factorization.

21045878345425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8173156752 (or 8173156747 counting only the distinct ones).

The product of its (nonzero) digits is 43008000, while the sum is 58.

The spelling of 21045878345425 in words is "twenty-one trillion, forty-five billion, eight hundred seventy-eight million, three hundred forty-five thousand, four hundred twenty-five".