21333434243 has 16 divisors (see below), whose sum is σ = 23482275840. Its totient is φ = 19220263200.

The previous prime is 21333434197. The next prime is 21333434261. The reversal of 21333434243 is 34243433312.

It is a cyclic number.

It is not a de Polignac number, because 21333434243 - 2⁶ = 21333434179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21333434293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 546296 + ... + 584042.

It is an arithmetic number, because the mean of its divisors is an integer number (1467642240).

Almost surely, 2^21333434243 is an apocalyptic number.

21333434243 is a deficient number, since it is larger than the sum of its proper divisors (2148841597).

21333434243 is a wasteful number, since it uses less digits than its factorization.

21333434243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38218.

The product of its digits is 62208, while the sum is 32.

Adding to 21333434243 its reverse (34243433312), we get a palindrome (55576867555).

The spelling of 21333434243 in words is "twenty-one billion, three hundred thirty-three million, four hundred thirty-four thousand, two hundred forty-three".