21330210043 has 2 divisors, whose sum is σ = 21330210044. Its totient is φ = 21330210042.

The previous prime is 21330210023. The next prime is 21330210047. The reversal of 21330210043 is 34001203312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21330210043 is a prime.

It is a super-3 number, since 3×21330210043³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21330210043.

It is not a weakly prime, because it can be changed into another prime (21330210047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665105021 + 10665105022.

It is an arithmetic number, because the mean of its divisors is an integer number (10665105022).

Almost surely, 2^21330210043 is an apocalyptic number.

21330210043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21330210043 is an equidigital number, since it uses as much as digits as its factorization.

21330210043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21330210043 its reverse (34001203312), we get a palindrome (55331413355).

The spelling of 21330210043 in words is "twenty-one billion, three hundred thirty million, two hundred ten thousand, forty-three".