121220111520203 has 2 divisors, whose sum is σ = 121220111520204. Its totient is φ = 121220111520202.

The previous prime is 121220111520187. The next prime is 121220111520229. The reversal of 121220111520203 is 302025111022121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121220111520203 - 2⁴ = 121220111520187 is a prime.

It is a super-2 number, since 2×121220111520203² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121220111580203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610055760101 + 60610055760102.

It is an arithmetic number, because the mean of its divisors is an integer number (60610055760102).

Almost surely, 2^{121220111520203} is an apocalyptic number.

121220111520203 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220111520203 is an equidigital number, since it uses as much as digits as its factorization.

121220111520203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 23.

Adding to 121220111520203 its reverse (302025111022121), we get a palindrome (423245222542324).

The spelling of 121220111520203 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, five hundred twenty thousand, two hundred three".