21495605040043 has 2 divisors, whose sum is σ = 21495605040044. Its totient is φ = 21495605040042.

The previous prime is 21495605039941. The next prime is 21495605040059. The reversal of 21495605040043 is 34004050659412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21495605040043 is a prime.

It is a super-2 number, since 2×21495605040043² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21495605040443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10747802520021 + 10747802520022.

It is an arithmetic number, because the mean of its divisors is an integer number (10747802520022).

Almost surely, 2^{21495605040043} is an apocalyptic number.

21495605040043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21495605040043 is an equidigital number, since it uses as much as digits as its factorization.

21495605040043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 43.

Adding to 21495605040043 its reverse (34004050659412), we get a palindrome (55499655699455).

The spelling of 21495605040043 in words is "twenty-one trillion, four hundred ninety-five billion, six hundred five million, forty thousand, forty-three".