2001123100043 has 2 divisors, whose sum is σ = 2001123100044. Its totient is φ = 2001123100042.

The previous prime is 2001123100021. The next prime is 2001123100091. The reversal of 2001123100043 is 3400013211002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001123100043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001123099994 and 2001123100030.

It is not a weakly prime, because it can be changed into another prime (2001123100003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000561550021 + 1000561550022.

It is an arithmetic number, because the mean of its divisors is an integer number (1000561550022).

Almost surely, 2^{2001123100043} is an apocalyptic number.

2001123100043 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001123100043 is an equidigital number, since it uses as much as digits as its factorization.

2001123100043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 2001123100043 its reverse (3400013211002), we get a palindrome (5401136311045).

The spelling of 2001123100043 in words is "two trillion, one billion, one hundred twenty-three million, one hundred thousand, forty-three".