20121302197 has 2 divisors, whose sum is σ = 20121302198. Its totient is φ = 20121302196.

The previous prime is 20121302177. The next prime is 20121302209. The reversal of 20121302197 is 79120312102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19053385156 + 1067917041 = 138034^2 + 32679^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121302197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121302177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060651098 + 10060651099.

It is an arithmetic number, because the mean of its divisors is an integer number (10060651099).

Almost surely, 2^20121302197 is an apocalyptic number.

It is an amenable number.

20121302197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121302197 is an equidigital number, since it uses as much as digits as its factorization.

20121302197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 28.

Adding to 20121302197 its reverse (79120312102), we get a palindrome (99241614299).

The spelling of 20121302197 in words is "twenty billion, one hundred twenty-one million, three hundred two thousand, one hundred ninety-seven".