121320200121 has 4 divisors (see below), whose sum is σ = 161760266832. Its totient is φ = 80880133412.

The previous prime is 121320200101. The next prime is 121320200147. The reversal of 121320200121 is 121002023121.

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 121320200121 - 2⁷ = 121320199993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121320200121.

It is not an unprimeable number, because it can be changed into a prime (121320200101) 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, 20220033351 + ... + 20220033356.

It is an arithmetic number, because the mean of its divisors is an integer number (40440066708).

Almost surely, 2^121320200121 is an apocalyptic number.

It is an amenable number.

121320200121 is a deficient number, since it is larger than the sum of its proper divisors (40440066711).

121320200121 is an equidigital number, since it uses as much as digits as its factorization.

121320200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40440066710.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 121320200121 its reverse (121002023121), we get a palindrome (242322223242).

The spelling of 121320200121 in words is "one hundred twenty-one billion, three hundred twenty million, two hundred thousand, one hundred twenty-one".