213020161 has 2 divisors, whose sum is σ = 213020162. Its totient is φ = 213020160.

The previous prime is 213020069. The next prime is 213020231. The reversal of 213020161 is 161020312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198274561 + 14745600 = 14081^2 + 3840^2 .

It is a cyclic number.

It is not a de Polignac number, because 213020161 - 2⁹ = 213019649 is a prime.

It is not a weakly prime, because it can be changed into another prime (213020861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106510080 + 106510081.

It is an arithmetic number, because the mean of its divisors is an integer number (106510081).

Almost surely, 2^213020161 is an apocalyptic number.

It is an amenable number.

213020161 is a deficient number, since it is larger than the sum of its proper divisors (1).

213020161 is an equidigital number, since it uses as much as digits as its factorization.

213020161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 213020161 is about 14595.2102074619. The cubic root of 213020161 is about 597.2281038544.

Adding to 213020161 its reverse (161020312), we get a palindrome (374040473).

The spelling of 213020161 in words is "two hundred thirteen million, twenty thousand, one hundred sixty-one".