21020020000043 has 2 divisors, whose sum is σ = 21020020000044. Its totient is φ = 21020020000042.

The previous prime is 21020019999991. The next prime is 21020020000073. The reversal of 21020020000043 is 34000002002012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21020020000043 - 2⁸ = 21020019999787 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21020019999982 and 21020020000027.

It is not a weakly prime, because it can be changed into another prime (21020020000073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510010000021 + 10510010000022.

It is an arithmetic number, because the mean of its divisors is an integer number (10510010000022).

Almost surely, 2^{21020020000043} is an apocalyptic number.

21020020000043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020020000043 is an equidigital number, since it uses as much as digits as its factorization.

21020020000043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 14.

Adding to 21020020000043 its reverse (34000002002012), we get a palindrome (55020022002055).

The spelling of 21020020000043 in words is "twenty-one trillion, twenty billion, twenty million, forty-three", and thus it is an aban number and an uban number.