21430751843 has 2 divisors, whose sum is σ = 21430751844. Its totient is φ = 21430751842.

The previous prime is 21430751827. The next prime is 21430751879. The reversal of 21430751843 is 34815703412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21430751843 - 2⁴ = 21430751827 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 21430751797 and 21430751806.

It is not a weakly prime, because it can be changed into another prime (21430751743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10715375921 + 10715375922.

It is an arithmetic number, because the mean of its divisors is an integer number (10715375922).

Almost surely, 2^21430751843 is an apocalyptic number.

21430751843 is a deficient number, since it is larger than the sum of its proper divisors (1).

21430751843 is an equidigital number, since it uses as much as digits as its factorization.

21430751843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 38.

The spelling of 21430751843 in words is "twenty-one billion, four hundred thirty million, seven hundred fifty-one thousand, eight hundred forty-three".