21252112325 has 24 divisors (see below), whose sum is σ = 26472487200. Its totient is φ = 16924541760.

The previous prime is 21252112319. The next prime is 21252112327. The reversal of 21252112325 is 52321125212.

It is a happy number.

It is not a de Polignac number, because 21252112325 - 2¹⁰ = 21252111301 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21252112294 and 21252112303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21252112327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5806346 + ... + 5810004.

It is an arithmetic number, because the mean of its divisors is an integer number (1103020300).

Almost surely, 2^21252112325 is an apocalyptic number.

21252112325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21252112325 is a deficient number, since it is larger than the sum of its proper divisors (5220374875).

21252112325 is a wasteful number, since it uses less digits than its factorization.

21252112325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4661 (or 4656 counting only the distinct ones).

The product of its digits is 2400, while the sum is 26.

Adding to 21252112325 its reverse (52321125212), we get a palindrome (73573237537).

The spelling of 21252112325 in words is "twenty-one billion, two hundred fifty-two million, one hundred twelve thousand, three hundred twenty-five".