21334432355 has 8 divisors (see below), whose sum is σ = 25684712592. Its totient is φ = 17011950048.

The previous prime is 21334432331. The next prime is 21334432393. The reversal of 21334432355 is 55323443312.

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 21334432355 - 2⁸ = 21334432099 is a prime.

It is a super-3 number, since 3×21334432355³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6947792 + ... + 6950861.

It is an arithmetic number, because the mean of its divisors is an integer number (3210589074).

Almost surely, 2^21334432355 is an apocalyptic number.

21334432355 is a deficient number, since it is larger than the sum of its proper divisors (4350280237).

21334432355 is a wasteful number, since it uses less digits than its factorization.

21334432355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13898965.

The product of its digits is 129600, while the sum is 35.

Adding to 21334432355 its reverse (55323443312), we get a palindrome (76657875667).

The spelling of 21334432355 in words is "twenty-one billion, three hundred thirty-four million, four hundred thirty-two thousand, three hundred fifty-five".