21252343125 has 160 divisors (see below), whose sum is σ = 40604502400. Its totient is φ = 9797760000.

The previous prime is 21252343121. The next prime is 21252343159. The reversal of 21252343125 is 52134325212.

It is not a de Polignac number, because 21252343125 - 2² = 21252343121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21252343092 and 21252343101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21252343121) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 50480415 + ... + 50480835.

It is an arithmetic number, because the mean of its divisors is an integer number (253778140).

Almost surely, 2^21252343125 is an apocalyptic number.

21252343125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21252343125 is a deficient number, since it is larger than the sum of its proper divisors (19352159275).

21252343125 is a wasteful number, since it uses less digits than its factorization.

21252343125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585 (or 570 counting only the distinct ones).

The product of its digits is 14400, while the sum is 30.

Adding to 21252343125 its reverse (52134325212), we get a palindrome (73386668337).

The spelling of 21252343125 in words is "twenty-one billion, two hundred fifty-two million, three hundred forty-three thousand, one hundred twenty-five".