20121202001161 has 2 divisors, whose sum is σ = 20121202001162. Its totient is φ = 20121202001160.

The previous prime is 20121202001143. The next prime is 20121202001177. The reversal of 20121202001161 is 16110020212102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12168802001161 + 7952400000000 = 3488381^2 + 2820000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121202001161 is a prime.

It is not a weakly prime, because it can be changed into another prime (26121202001161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060601000580 + 10060601000581.

It is an arithmetic number, because the mean of its divisors is an integer number (10060601000581).

Almost surely, 2^{20121202001161} is an apocalyptic number.

It is an amenable number.

20121202001161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121202001161 is an equidigital number, since it uses as much as digits as its factorization.

20121202001161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 20121202001161 its reverse (16110020212102), we get a palindrome (36231222213263).

The spelling of 20121202001161 in words is "twenty trillion, one hundred twenty-one billion, two hundred two million, one thousand, one hundred sixty-one".