20120210197 has 4 divisors (see below), whose sum is σ = 20152820556. Its totient is φ = 20087599840.

The previous prime is 20120210137. The next prime is 20120210203. The reversal of 20120210197 is 79101202102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8852175396 + 11268034801 = 94086^2 + 106151^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120210197 - 2⁷ = 20120210069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120210137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16304254 + ... + 16305487.

It is an arithmetic number, because the mean of its divisors is an integer number (5038205139).

Almost surely, 2^20120210197 is an apocalyptic number.

It is an amenable number.

20120210197 is a deficient number, since it is larger than the sum of its proper divisors (32610359).

20120210197 is an equidigital number, since it uses as much as digits as its factorization.

20120210197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32610358.

The product of its (nonzero) digits is 504, while the sum is 25.

Adding to 20120210197 its reverse (79101202102), we get a palindrome (99221412299).

The spelling of 20120210197 in words is "twenty billion, one hundred twenty million, two hundred ten thousand, one hundred ninety-seven".