21074214475217 has 2 divisors, whose sum is σ = 21074214475218. Its totient is φ = 21074214475216.

The previous prime is 21074214475207. The next prime is 21074214475229. The reversal of 21074214475217 is 71257441247012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12182361624976 + 8891852850241 = 3490324^2 + 2981921^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21074214475217 is a prime.

It is not a weakly prime, because it can be changed into another prime (21074214475207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10537107237608 + 10537107237609.

It is an arithmetic number, because the mean of its divisors is an integer number (10537107237609).

Almost surely, 2^{21074214475217} is an apocalyptic number.

It is an amenable number.

21074214475217 is a deficient number, since it is larger than the sum of its proper divisors (1).

21074214475217 is an equidigital number, since it uses as much as digits as its factorization.

21074214475217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 878080, while the sum is 47.

The spelling of 21074214475217 in words is "twenty-one trillion, seventy-four billion, two hundred fourteen million, four hundred seventy-five thousand, two hundred seventeen".