20130212161 has 2 divisors, whose sum is σ = 20130212162. Its totient is φ = 20130212160.

The previous prime is 20130212129. The next prime is 20130212213. The reversal of 20130212161 is 16121203102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14880340225 + 5249871936 = 121985^2 + 72456^2 .

It is a cyclic number.

It is not a de Polignac number, because 20130212161 - 2⁵ = 20130212129 is a prime.

It is not a weakly prime, because it can be changed into another prime (20130212101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10065106080 + 10065106081.

It is an arithmetic number, because the mean of its divisors is an integer number (10065106081).

Almost surely, 2^20130212161 is an apocalyptic number.

It is an amenable number.

20130212161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20130212161 is an equidigital number, since it uses as much as digits as its factorization.

20130212161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 20130212161 its reverse (16121203102), we get a palindrome (36251415263).

The spelling of 20130212161 in words is "twenty billion, one hundred thirty million, two hundred twelve thousand, one hundred sixty-one".