2001135521023 has 2 divisors, whose sum is σ = 2001135521024. Its totient is φ = 2001135521022.

The previous prime is 2001135520987. The next prime is 2001135521027. The reversal of 2001135521023 is 3201255311002.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001135521023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001135521027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000567760511 + 1000567760512.

It is an arithmetic number, because the mean of its divisors is an integer number (1000567760512).

Almost surely, 2^{2001135521023} is an apocalyptic number.

2001135521023 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001135521023 is an equidigital number, since it uses as much as digits as its factorization.

2001135521023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 25.

The spelling of 2001135521023 in words is "two trillion, one billion, one hundred thirty-five million, five hundred twenty-one thousand, twenty-three".