21221020000043 has 2 divisors, whose sum is σ = 21221020000044. Its totient is φ = 21221020000042.

The previous prime is 21221020000021. The next prime is 21221020000069. The reversal of 21221020000043 is 34000002012212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221020000043 - 2²⁴ = 21221003222827 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221019999976 and 21221020000030.

It is not a weakly prime, because it can be changed into another prime (21221020200043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610510000021 + 10610510000022.

It is an arithmetic number, because the mean of its divisors is an integer number (10610510000022).

Almost surely, 2^{21221020000043} is an apocalyptic number.

21221020000043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221020000043 is an equidigital number, since it uses as much as digits as its factorization.

21221020000043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21221020000043 its reverse (34000002012212), we get a palindrome (55221022012255).

The spelling of 21221020000043 in words is "twenty-one trillion, two hundred twenty-one billion, twenty million, forty-three", and thus it is an aban number.