21134409943 has 2 divisors, whose sum is σ = 21134409944. Its totient is φ = 21134409942.

The previous prime is 21134409893. The next prime is 21134410051. The reversal of 21134409943 is 34990443112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21134409943 - 2¹⁷ = 21134278871 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21134409896 and 21134409905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21134409143) 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, 10567204971 + 10567204972.

It is an arithmetic number, because the mean of its divisors is an integer number (10567204972).

Almost surely, 2^21134409943 is an apocalyptic number.

21134409943 is a deficient number, since it is larger than the sum of its proper divisors (1).

21134409943 is an equidigital number, since it uses as much as digits as its factorization.

21134409943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 40.

The spelling of 21134409943 in words is "twenty-one billion, one hundred thirty-four million, four hundred nine thousand, nine hundred forty-three".