21242313125 has 20 divisors (see below), whose sum is σ = 28957530624. Its totient is φ = 15448950000.

The previous prime is 21242313119. The next prime is 21242313151. The reversal of 21242313125 is 52131324212.

It is not a de Polignac number, because 21242313125 - 2⁶ = 21242313061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21242313094 and 21242313103.

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 1538021 + ... + 1551770.

Almost surely, 2^21242313125 is an apocalyptic number.

21242313125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21242313125 is a deficient number, since it is larger than the sum of its proper divisors (7715217499).

21242313125 is an equidigital number, since it uses as much as digits as its factorization.

21242313125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3089822 (or 3089807 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

Adding to 21242313125 its reverse (52131324212), we get a palindrome (73373637337).

The spelling of 21242313125 in words is "twenty-one billion, two hundred forty-two million, three hundred thirteen thousand, one hundred twenty-five".