21233280433 has 2 divisors, whose sum is σ = 21233280434. Its totient is φ = 21233280432.

The previous prime is 21233280427. The next prime is 21233280437. The reversal of 21233280433 is 33408233212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13035245584 + 8198034849 = 114172^2 + 90543^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233280433 - 2²⁵ = 21199726001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21233280395 and 21233280404.

It is not a weakly prime, because it can be changed into another prime (21233280437) 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 as a sum of consecutive naturals, namely, 10616640216 + 10616640217.

It is an arithmetic number, because the mean of its divisors is an integer number (10616640217).

Almost surely, 2^21233280433 is an apocalyptic number.

It is an amenable number.

21233280433 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233280433 is an equidigital number, since it uses as much as digits as its factorization.

21233280433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 31.

The spelling of 21233280433 in words is "twenty-one billion, two hundred thirty-three million, two hundred eighty thousand, four hundred thirty-three".