21452105025 has 72 divisors (see below), whose sum is σ = 41435750720. Its totient is φ = 10546485120.

The previous prime is 21452104969. The next prime is 21452105057. The reversal of 21452105025 is 52050125412.

21452105025 is a `hidden beast` number, since 2 + 145 + 2 + 10 + 502 + 5 = 666.

It is not a de Polignac number, because 21452105025 - 2⁷ = 21452104897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21452105025.

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 71 ways as a sum of consecutive naturals, for example, 2297316 + ... + 2306634.

Almost surely, 2^21452105025 is an apocalyptic number.

21452105025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21452105025 is a deficient number, since it is larger than the sum of its proper divisors (19983645695).

21452105025 is a wasteful number, since it uses less digits than its factorization.

21452105025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10135 (or 10127 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The spelling of 21452105025 in words is "twenty-one billion, four hundred fifty-two million, one hundred five thousand, twenty-five".