21333123243434 has 16 divisors (see below), whose sum is σ = 32682249190656. Its totient is φ = 10439064068400.

The previous prime is 21333123243413. The next prime is 21333123243437. The reversal of 21333123243434 is 43434232133312.

It is a super-2 number, since 2×21333123243434² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21333123243437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4173677 + ... + 7751504.

It is an arithmetic number, because the mean of its divisors is an integer number (2042640574416).

Almost surely, 2^{21333123243434} is an apocalyptic number.

21333123243434 is a deficient number, since it is larger than the sum of its proper divisors (11349125947222).

21333123243434 is a wasteful number, since it uses less digits than its factorization.

21333123243434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11944261.

The product of its digits is 373248, while the sum is 38.

Adding to 21333123243434 its reverse (43434232133312), we get a palindrome (64767355376746).

The spelling of 21333123243434 in words is "twenty-one trillion, three hundred thirty-three billion, one hundred twenty-three million, two hundred forty-three thousand, four hundred thirty-four".