213121203333161 has 2 divisors, whose sum is σ = 213121203333162. Its totient is φ = 213121203333160.

The previous prime is 213121203333053. The next prime is 213121203333193. The reversal of 213121203333161 is 161333302121312.

It is an a-pointer prime, because the next prime (213121203333193) can be obtained adding 213121203333161 to its sum of digits (32).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116357211610000 + 96763991723161 = 10786900^2 + 9836869^2 .

It is a cyclic number.

It is not a de Polignac number, because 213121203333161 - 2³⁰ = 213120129591337 is a prime.

It is not a weakly prime, because it can be changed into another prime (213121203303161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106560601666580 + 106560601666581.

It is an arithmetic number, because the mean of its divisors is an integer number (106560601666581).

Almost surely, 2^{213121203333161} is an apocalyptic number.

It is an amenable number.

213121203333161 is a deficient number, since it is larger than the sum of its proper divisors (1).

213121203333161 is an equidigital number, since it uses as much as digits as its factorization.

213121203333161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 32.

Adding to 213121203333161 its reverse (161333302121312), we get a palindrome (374454505454473).

The spelling of 213121203333161 in words is "two hundred thirteen trillion, one hundred twenty-one billion, two hundred three million, three hundred thirty-three thousand, one hundred sixty-one".