21214434433 has 2 divisors, whose sum is σ = 21214434434. Its totient is φ = 21214434432.

The previous prime is 21214434427. The next prime is 21214434469. The reversal of 21214434433 is 33443441212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11279926849 + 9934507584 = 106207^2 + 99672^2 .

It is a cyclic number.

It is not a de Polignac number, because 21214434433 - 2²⁹ = 20677563521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21214434395 and 21214434404.

It is not a weakly prime, because it can be changed into another prime (21214434403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607217216 + 10607217217.

It is an arithmetic number, because the mean of its divisors is an integer number (10607217217).

Almost surely, 2^21214434433 is an apocalyptic number.

It is an amenable number.

21214434433 is a deficient number, since it is larger than the sum of its proper divisors (1).

21214434433 is an equidigital number, since it uses as much as digits as its factorization.

21214434433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 31.

Adding to 21214434433 its reverse (33443441212), we get a palindrome (54657875645).

The spelling of 21214434433 in words is "twenty-one billion, two hundred fourteen million, four hundred thirty-four thousand, four hundred thirty-three".