20013421013917 has 2 divisors, whose sum is σ = 20013421013918. Its totient is φ = 20013421013916.

The previous prime is 20013421013867. The next prime is 20013421013923. The reversal of 20013421013917 is 71931012431002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10022675871321 + 9990745142596 = 3165861^2 + 3160814^2 .

It is a cyclic number.

It is not a de Polignac number, because 20013421013917 - 2¹¹ = 20013421011869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20013421013947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006710506958 + 10006710506959.

It is an arithmetic number, because the mean of its divisors is an integer number (10006710506959).

Almost surely, 2^{20013421013917} is an apocalyptic number.

It is an amenable number.

20013421013917 is a deficient number, since it is larger than the sum of its proper divisors (1).

20013421013917 is an equidigital number, since it uses as much as digits as its factorization.

20013421013917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

Adding to 20013421013917 its reverse (71931012431002), we get a palindrome (91944433444919).

The spelling of 20013421013917 in words is "twenty trillion, thirteen billion, four hundred twenty-one million, thirteen thousand, nine hundred seventeen".