20121002197 has 8 divisors (see below), whose sum is σ = 20777280512. Its totient is φ = 19465174800.

The previous prime is 20121002189. The next prime is 20121002201. The reversal of 20121002197 is 79120012102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20121002197 - 2³ = 20121002189 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 (20121002177) 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 7 ways as a sum of consecutive naturals, for example, 20829 + ... + 201682.

It is an arithmetic number, because the mean of its divisors is an integer number (2597160064).

Almost surely, 2^20121002197 is an apocalyptic number.

It is an amenable number.

20121002197 is a deficient number, since it is larger than the sum of its proper divisors (656278315).

20121002197 is a wasteful number, since it uses less digits than its factorization.

20121002197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225459.

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

Adding to 20121002197 its reverse (79120012102), we get a palindrome (99241014299).

The spelling of 20121002197 in words is "twenty billion, one hundred twenty-one million, two thousand, one hundred ninety-seven".