21030765043 has 2 divisors, whose sum is σ = 21030765044. Its totient is φ = 21030765042.

The previous prime is 21030764987. The next prime is 21030765073. The reversal of 21030765043 is 34056703012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21030765043 - 2¹⁷ = 21030633971 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21030764996 and 21030765014.

It is not a weakly prime, because it can be changed into another prime (21030765073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515382521 + 10515382522.

It is an arithmetic number, because the mean of its divisors is an integer number (10515382522).

Almost surely, 2^21030765043 is an apocalyptic number.

21030765043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030765043 is an equidigital number, since it uses as much as digits as its factorization.

21030765043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 31.

The spelling of 21030765043 in words is "twenty-one billion, thirty million, seven hundred sixty-five thousand, forty-three".