20123101197 has 6 divisors (see below), whose sum is σ = 29066701742. Its totient is φ = 13415400792.

The previous prime is 20123101181. The next prime is 20123101211. The reversal of 20123101197 is 79110132102.

It can be written as a sum of positive squares in only one way, i.e., 19777921956 + 345179241 = 140634^2 + 18579^2 .

It is not a de Polignac number, because 20123101197 - 2⁴ = 20123101181 is a prime.

It is a super-3 number, since 3×20123101197³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20123101197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123101177) 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 in 5 ways as a sum of consecutive naturals, for example, 1117950058 + ... + 1117950075.

Almost surely, 2^20123101197 is an apocalyptic number.

It is an amenable number.

20123101197 is a deficient number, since it is larger than the sum of its proper divisors (8943600545).

20123101197 is a wasteful number, since it uses less digits than its factorization.

20123101197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2235900139 (or 2235900136 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

Adding to 20123101197 its reverse (79110132102), we get a palindrome (99233233299).

The spelling of 20123101197 in words is "twenty billion, one hundred twenty-three million, one hundred one thousand, one hundred ninety-seven".