21002012200217 has 2 divisors, whose sum is σ = 21002012200218. Its totient is φ = 21002012200216.

The previous prime is 21002012200193. The next prime is 21002012200241. The reversal of 21002012200217 is 71200221020012.

It is a balanced prime because it is at equal distance from previous prime (21002012200193) and next prime (21002012200241).

It can be written as a sum of positive squares in only one way, i.e., 19717187683216 + 1284824517001 = 4440404^2 + 1133501^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002012200217 - 2³⁸ = 20727134293273 is a prime.

It is not a weakly prime, because it can be changed into another prime (21002012200277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501006100108 + 10501006100109.

It is an arithmetic number, because the mean of its divisors is an integer number (10501006100109).

Almost surely, 2^{21002012200217} is an apocalyptic number.

It is an amenable number.

21002012200217 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002012200217 is an equidigital number, since it uses as much as digits as its factorization.

21002012200217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 21002012200217 its reverse (71200221020012), we get a palindrome (92202233220229).

The spelling of 21002012200217 in words is "twenty-one trillion, two billion, twelve million, two hundred thousand, two hundred seventeen".