2123021321017 has 2 divisors, whose sum is σ = 2123021321018. Its totient is φ = 2123021321016.

The previous prime is 2123021321009. The next prime is 2123021321077. The reversal of 2123021321017 is 7101231203212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1153946459961 + 969074861056 = 1074219^2 + 984416^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123021321017 - 2³ = 2123021321009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2123021320982 and 2123021321000.

It is not a weakly prime, because it can be changed into another prime (2123021321077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061510660508 + 1061510660509.

It is an arithmetic number, because the mean of its divisors is an integer number (1061510660509).

Almost surely, 2^{2123021321017} is an apocalyptic number.

It is an amenable number.

2123021321017 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123021321017 is an equidigital number, since it uses as much as digits as its factorization.

2123021321017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

Adding to 2123021321017 its reverse (7101231203212), we get a palindrome (9224252524229).

The spelling of 2123021321017 in words is "two trillion, one hundred twenty-three billion, twenty-one million, three hundred twenty-one thousand, seventeen".