21250030125 has 32 divisors (see below), whose sum is σ = 35381923200. Its totient is φ = 11326339200.

The previous prime is 21250030091. The next prime is 21250030127. The reversal of 21250030125 is 52103005212.

It is not a de Polignac number, because 21250030125 - 2¹¹ = 21250028077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21250030127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 620449 + ... + 653801.

It is an arithmetic number, because the mean of its divisors is an integer number (1105685100).

Almost surely, 2^21250030125 is an apocalyptic number.

21250030125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21250030125 is a deficient number, since it is larger than the sum of its proper divisors (14131893075).

21250030125 is a wasteful number, since it uses less digits than its factorization.

21250030125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35070 (or 35060 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

Adding to 21250030125 its reverse (52103005212), we get a palindrome (73353035337).

The spelling of 21250030125 in words is "twenty-one billion, two hundred fifty million, thirty thousand, one hundred twenty-five".