21010525425 has 36 divisors (see below), whose sum is σ = 37640195164. Its totient is φ = 11203228800.

The previous prime is 21010525411. The next prime is 21010525429. The reversal of 21010525425 is 52452501012.

21010525425 is a `hidden beast` number, since 2 + 10 + 105 + 2 + 542 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 108305649 + 20902219776 = 10407^2 + 144576^2 .

It is not a de Polignac number, because 21010525425 - 2⁴ = 21010525409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010525429) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 1708599 + ... + 1720851.

Almost surely, 2^21010525425 is an apocalyptic number.

21010525425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21010525425 is a deficient number, since it is larger than the sum of its proper divisors (16629669739).

21010525425 is a wasteful number, since it uses less digits than its factorization.

21010525425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19890 (or 19882 counting only the distinct ones).

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

The spelling of 21010525425 in words is "twenty-one billion, ten million, five hundred twenty-five thousand, four hundred twenty-five".