21535400005 has 8 divisors (see below), whose sum is σ = 29534262912. Its totient is φ = 14767131408.

The previous prime is 21535399999. The next prime is 21535400011. The reversal of 21535400005 is 50000453512.

It is an interprime number because it is at equal distance from previous prime (21535399999) and next prime (21535400011).

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 21535400005 - 2⁵ = 21535399973 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307648537 + ... + 307648606.

It is an arithmetic number, because the mean of its divisors is an integer number (3691782864).

Almost surely, 2^21535400005 is an apocalyptic number.

It is an amenable number.

21535400005 is a deficient number, since it is larger than the sum of its proper divisors (7998862907).

21535400005 is an equidigital number, since it uses as much as digits as its factorization.

21535400005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615297155.

The product of its (nonzero) digits is 3000, while the sum is 25.

Adding to 21535400005 its reverse (50000453512), we get a palindrome (71535853517).

The spelling of 21535400005 in words is "twenty-one billion, five hundred thirty-five million, four hundred thousand, five".