21121014017 has 2 divisors, whose sum is σ = 21121014018. Its totient is φ = 21121014016.

The previous prime is 21121013891. The next prime is 21121014043. The reversal of 21121014017 is 71041012112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13115059441 + 8005954576 = 114521^2 + 89476^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21121014017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21121014017.

It is not a weakly prime, because it can be changed into another prime (21121010017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560507008 + 10560507009.

It is an arithmetic number, because the mean of its divisors is an integer number (10560507009).

Almost surely, 2^21121014017 is an apocalyptic number.

It is an amenable number.

21121014017 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121014017 is an equidigital number, since it uses as much as digits as its factorization.

21121014017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 21121014017 its reverse (71041012112), we get a palindrome (92162026129).

The spelling of 21121014017 in words is "twenty-one billion, one hundred twenty-one million, fourteen thousand, seventeen".