21536200425 has 12 divisors (see below), whose sum is σ = 35606518160. Its totient is φ = 11485973520.

The previous prime is 21536200403. The next prime is 21536200471. The reversal of 21536200425 is 52400263512.

It is not a de Polignac number, because 21536200425 - 2¹¹ = 21536198377 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21536200392 and 21536200401.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143574595 + ... + 143574744.

Almost surely, 2^21536200425 is an apocalyptic number.

21536200425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21536200425 is a deficient number, since it is larger than the sum of its proper divisors (14070317735).

21536200425 is a wasteful number, since it uses less digits than its factorization.

21536200425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287149352 (or 287149347 counting only the distinct ones).

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

Adding to 21536200425 its reverse (52400263512), we get a palindrome (73936463937).

The spelling of 21536200425 in words is "twenty-one billion, five hundred thirty-six million, two hundred thousand, four hundred twenty-five".