21000112002217 has 2 divisors, whose sum is σ = 21000112002218. Its totient is φ = 21000112002216.

The previous prime is 21000112002143. The next prime is 21000112002227. The reversal of 21000112002217 is 71220021100012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20678701243456 + 321410758761 = 4547384^2 + 566931^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000112002217 is a prime.

It is a super-2 number, since 2×21000112002217² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21000112002194 and 21000112002203.

It is not a weakly prime, because it can be changed into another prime (21000112002227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500056001108 + 10500056001109.

It is an arithmetic number, because the mean of its divisors is an integer number (10500056001109).

Almost surely, 2^{21000112002217} is an apocalyptic number.

It is an amenable number.

21000112002217 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000112002217 is an equidigital number, since it uses as much as digits as its factorization.

21000112002217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 21000112002217 its reverse (71220021100012), we get a palindrome (92220133102229).

The spelling of 21000112002217 in words is "twenty-one trillion, one hundred twelve million, two thousand, two hundred seventeen".