21625506635 has 4 divisors (see below), whose sum is σ = 25950607968. Its totient is φ = 17300405304.

The previous prime is 21625506629. The next prime is 21625506731. The reversal of 21625506635 is 53660552612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21625506635 - 2⁶ = 21625506571 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21625506592 and 21625506601.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2162550659 + ... + 2162550668.

It is an arithmetic number, because the mean of its divisors is an integer number (6487651992).

Almost surely, 2^21625506635 is an apocalyptic number.

21625506635 is a deficient number, since it is larger than the sum of its proper divisors (4325101333).

21625506635 is an equidigital number, since it uses as much as digits as its factorization.

21625506635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4325101332.

The product of its (nonzero) digits is 324000, while the sum is 41.

The spelling of 21625506635 in words is "twenty-one billion, six hundred twenty-five million, five hundred six thousand, six hundred thirty-five".