21333111355 has 8 divisors (see below), whose sum is σ = 26082747792. Its totient is φ = 16744479648.

The previous prime is 21333111353. The next prime is 21333111383. The reversal of 21333111355 is 55311133312.

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 21333111355 - 2¹ = 21333111353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21333111353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40250889 + ... + 40251418.

It is an arithmetic number, because the mean of its divisors is an integer number (3260343474).

Almost surely, 2^21333111355 is an apocalyptic number.

21333111355 is a deficient number, since it is larger than the sum of its proper divisors (4749636437).

21333111355 is an equidigital number, since it uses as much as digits as its factorization.

21333111355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80502365.

The product of its digits is 4050, while the sum is 28.

Adding to 21333111355 its reverse (55311133312), we get a palindrome (76644244667).

The spelling of 21333111355 in words is "twenty-one billion, three hundred thirty-three million, one hundred eleven thousand, three hundred fifty-five".