2001032023721 has 2 divisors, whose sum is σ = 2001032023722. Its totient is φ = 2001032023720.

The previous prime is 2001032023693. The next prime is 2001032023733. The reversal of 2001032023721 is 1273202301002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1987310478400 + 13721545321 = 1409720^2 + 117139^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001032023721 - 2³⁸ = 1726154116777 is a prime.

It is not a weakly prime, because it can be changed into another prime (2001032823721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000516011860 + 1000516011861.

It is an arithmetic number, because the mean of its divisors is an integer number (1000516011861).

Almost surely, 2^{2001032023721} is an apocalyptic number.

It is an amenable number.

2001032023721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001032023721 is an equidigital number, since it uses as much as digits as its factorization.

2001032023721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 23.

Adding to 2001032023721 its reverse (1273202301002), we get a palindrome (3274234324723).

The spelling of 2001032023721 in words is "two trillion, one billion, thirty-two million, twenty-three thousand, seven hundred twenty-one".