21333254345 has 32 divisors (see below), whose sum is σ = 28666552320. Its totient is φ = 15134123520.

The previous prime is 21333254291. The next prime is 21333254401. The reversal of 21333254345 is 54345233312.

It is not a de Polignac number, because 21333254345 - 2¹⁰ = 21333253321 is a prime.

It is a super-2 number, since 2×21333254345² (a number of 21 digits) contains 22 as substring.

It is a Curzon 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 31 ways as a sum of consecutive naturals, for example, 237416 + ... + 314694.

It is an arithmetic number, because the mean of its divisors is an integer number (895829760).

Almost surely, 2^21333254345 is an apocalyptic number.

It is an amenable number.

21333254345 is a deficient number, since it is larger than the sum of its proper divisors (7333297975).

21333254345 is a wasteful number, since it uses less digits than its factorization.

21333254345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77465.

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

Adding to 21333254345 its reverse (54345233312), we get a palindrome (75678487657).

The spelling of 21333254345 in words is "twenty-one billion, three hundred thirty-three million, two hundred fifty-four thousand, three hundred forty-five".