21321043432043 has 2 divisors, whose sum is σ = 21321043432044. Its totient is φ = 21321043432042.

The previous prime is 21321043432019. The next prime is 21321043432049. The reversal of 21321043432043 is 34023434012312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21321043432043 is a prime.

It is not a weakly prime, because it can be changed into another prime (21321043432049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660521716021 + 10660521716022.

It is an arithmetic number, because the mean of its divisors is an integer number (10660521716022).

Almost surely, 2^{21321043432043} is an apocalyptic number.

21321043432043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321043432043 is an equidigital number, since it uses as much as digits as its factorization.

21321043432043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 32.

Adding to 21321043432043 its reverse (34023434012312), we get a palindrome (55344477444355).

The spelling of 21321043432043 in words is "twenty-one trillion, three hundred twenty-one billion, forty-three million, four hundred thirty-two thousand, forty-three".