20000198121 has 4 divisors (see below), whose sum is σ = 26666930832. Its totient is φ = 13333465412.

The previous prime is 20000198107. The next prime is 20000198147. The reversal of 20000198121 is 12189100002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20000198121 - 2¹⁷ = 20000067049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20000198091 and 20000198100.

It is not an unprimeable number, because it can be changed into a prime (20000198221) 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 3 ways as a sum of consecutive naturals, for example, 3333366351 + ... + 3333366356.

It is an arithmetic number, because the mean of its divisors is an integer number (6666732708).

Almost surely, 2^20000198121 is an apocalyptic number.

It is an amenable number.

20000198121 is a deficient number, since it is larger than the sum of its proper divisors (6666732711).

20000198121 is an equidigital number, since it uses as much as digits as its factorization.

20000198121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6666732710.

The product of its (nonzero) digits is 288, while the sum is 24.

Adding to 20000198121 its reverse (12189100002), we get a palindrome (32189298123).

The spelling of 20000198121 in words is "twenty billion, one hundred ninety-eight thousand, one hundred twenty-one".