21533234243 has 2 divisors, whose sum is σ = 21533234244. Its totient is φ = 21533234242.

The previous prime is 21533234237. The next prime is 21533234249. The reversal of 21533234243 is 34243233512.

It is a balanced prime because it is at equal distance from previous prime (21533234237) and next prime (21533234249).

It is a cyclic number.

It is not a de Polignac number, because 21533234243 - 2⁸ = 21533233987 is a prime.

It is not a weakly prime, because it can be changed into another prime (21533234249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10766617121 + 10766617122.

It is an arithmetic number, because the mean of its divisors is an integer number (10766617122).

Almost surely, 2^21533234243 is an apocalyptic number.

21533234243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21533234243 is an equidigital number, since it uses as much as digits as its factorization.

21533234243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 32.

Adding to 21533234243 its reverse (34243233512), we get a palindrome (55776467755).

The spelling of 21533234243 in words is "twenty-one billion, five hundred thirty-three million, two hundred thirty-four thousand, two hundred forty-three".