213170261081 has 2 divisors, whose sum is σ = 213170261082. Its totient is φ = 213170261080.

The previous prime is 213170261071. The next prime is 213170261089. The reversal of 213170261081 is 180162071312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160128025600 + 53042235481 = 400160^2 + 230309^2 .

It is a cyclic number.

It is not a de Polignac number, because 213170261081 - 2¹⁰ = 213170260057 is a prime.

It is a super-2 number, since 2×213170261081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (213170261089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106585130540 + 106585130541.

It is an arithmetic number, because the mean of its divisors is an integer number (106585130541).

Almost surely, 2^213170261081 is an apocalyptic number.

It is an amenable number.

213170261081 is a deficient number, since it is larger than the sum of its proper divisors (1).

213170261081 is an equidigital number, since it uses as much as digits as its factorization.

213170261081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The spelling of 213170261081 in words is "two hundred thirteen billion, one hundred seventy million, two hundred sixty-one thousand, eighty-one".