2121000043 has 2 divisors, whose sum is σ = 2121000044. Its totient is φ = 2121000042.

The previous prime is 2121000031. The next prime is 2121000047. The reversal of 2121000043 is 3400001212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121000043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2120999987 and 2121000032.

It is not a weakly prime, because it can be changed into another prime (2121000047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060500021 + 1060500022.

It is an arithmetic number, because the mean of its divisors is an integer number (1060500022).

Almost surely, 2^2121000043 is an apocalyptic number.

2121000043 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121000043 is an equidigital number, since it uses as much as digits as its factorization.

2121000043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 2121000043 is about 46054.3162255179. The cubic root of 2121000043 is about 1284.8336207543.

Adding to 2121000043 its reverse (3400001212), we get a palindrome (5521001255).

The spelling of 2121000043 in words is "two billion, one hundred twenty-one million, forty-three", and thus it is an aban number.