43421321023 has 2 divisors, whose sum is σ = 43421321024. Its totient is φ = 43421321022.

The previous prime is 43421321011. The next prime is 43421321039. The reversal of 43421321023 is 32012312434.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43421321023 - 2¹⁷ = 43421189951 is a prime.

It is a super-2 number, since 2×43421321023² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43421321003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21710660511 + 21710660512.

It is an arithmetic number, because the mean of its divisors is an integer number (21710660512).

Almost surely, 2^43421321023 is an apocalyptic number.

43421321023 is a deficient number, since it is larger than the sum of its proper divisors (1).

43421321023 is an equidigital number, since it uses as much as digits as its factorization.

43421321023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 43421321023 its reverse (32012312434), we get a palindrome (75433633457).

The spelling of 43421321023 in words is "forty-three billion, four hundred twenty-one million, three hundred twenty-one thousand, twenty-three".