21414975443 has 2 divisors, whose sum is σ = 21414975444. Its totient is φ = 21414975442.

The previous prime is 21414975419. The next prime is 21414975451. The reversal of 21414975443 is 34457941412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21414975443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21414975394 and 21414975403.

It is not a weakly prime, because it can be changed into another prime (21414905443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10707487721 + 10707487722.

It is an arithmetic number, because the mean of its divisors is an integer number (10707487722).

Almost surely, 2^21414975443 is an apocalyptic number.

21414975443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21414975443 is an equidigital number, since it uses as much as digits as its factorization.

21414975443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 44.

The spelling of 21414975443 in words is "twenty-one billion, four hundred fourteen million, nine hundred seventy-five thousand, four hundred forty-three".