21425421235 has 8 divisors (see below), whose sum is σ = 25731432720. Its totient is φ = 17126385504.

The previous prime is 21425421229. The next prime is 21425421253. The reversal of 21425421235 is 53212452412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21425421235 - 2⁵ = 21425421203 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21425421197 and 21425421206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1737177 + ... + 1749466.

It is an arithmetic number, because the mean of its divisors is an integer number (3216429090).

Almost surely, 2^21425421235 is an apocalyptic number.

21425421235 is a deficient number, since it is larger than the sum of its proper divisors (4306011485).

21425421235 is a wasteful number, since it uses less digits than its factorization.

21425421235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3487877.

The product of its digits is 19200, while the sum is 31.

Adding to 21425421235 its reverse (53212452412), we get a palindrome (74637873647).

The spelling of 21425421235 in words is "twenty-one billion, four hundred twenty-five million, four hundred twenty-one thousand, two hundred thirty-five".