2001232103621 has 2 divisors, whose sum is σ = 2001232103622. Its totient is φ = 2001232103620.

The previous prime is 2001232103581. The next prime is 2001232103639. The reversal of 2001232103621 is 1263012321002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1112784472996 + 888447630625 = 1054886^2 + 942575^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001232103621 - 2²⁶ = 2001164994757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001232109621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000616051810 + 1000616051811.

It is an arithmetic number, because the mean of its divisors is an integer number (1000616051811).

Almost surely, 2^{2001232103621} is an apocalyptic number.

It is an amenable number.

2001232103621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001232103621 is an equidigital number, since it uses as much as digits as its factorization.

2001232103621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 2001232103621 its reverse (1263012321002), we get a palindrome (3264244424623).

The spelling of 2001232103621 in words is "two trillion, one billion, two hundred thirty-two million, one hundred three thousand, six hundred twenty-one".