171221002133 has 2 divisors, whose sum is σ = 171221002134. Its totient is φ = 171221002132.

The previous prime is 171221002093. The next prime is 171221002159. The reversal of 171221002133 is 331200122171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167777894449 + 3443107684 = 409607^2 + 58678^2 .

It is an emirp because it is prime and its reverse (331200122171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 171221002133 - 2¹⁰ = 171221001109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 171221002099 and 171221002108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171221004133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85610501066 + 85610501067.

It is an arithmetic number, because the mean of its divisors is an integer number (85610501067).

Almost surely, 2^171221002133 is an apocalyptic number.

It is an amenable number.

171221002133 is a deficient number, since it is larger than the sum of its proper divisors (1).

171221002133 is an equidigital number, since it uses as much as digits as its factorization.

171221002133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 23.

The spelling of 171221002133 in words is "one hundred seventy-one billion, two hundred twenty-one million, two thousand, one hundred thirty-three".