21333555345 has 16 divisors (see below), whose sum is σ = 34160037120. Its totient is φ = 11369113344.

The previous prime is 21333555343. The next prime is 21333555359. The reversal of 21333555345 is 54355533312.

It is not a de Polignac number, because 21333555345 - 2¹ = 21333555343 is a prime.

It is a super-3 number, since 3×21333555345³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21333555343) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 528825 + ... + 567734.

It is an arithmetic number, because the mean of its divisors is an integer number (2135002320).

Almost surely, 2^21333555345 is an apocalyptic number.

It is an amenable number.

21333555345 is a deficient number, since it is larger than the sum of its proper divisors (12826481775).

21333555345 is a wasteful number, since it uses less digits than its factorization.

21333555345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1097864.

The product of its digits is 405000, while the sum is 39.

The spelling of 21333555345 in words is "twenty-one billion, three hundred thirty-three million, five hundred fifty-five thousand, three hundred forty-five".