121221020203 has 2 divisors, whose sum is σ = 121221020204. Its totient is φ = 121221020202.

The previous prime is 121221020189. The next prime is 121221020251. The reversal of 121221020203 is 302020122121.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (302020122121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121221020203 - 2²⁵ = 121187465771 is a prime.

It is a super-2 number, since 2×121221020203² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121221020293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610510101 + 60610510102.

It is an arithmetic number, because the mean of its divisors is an integer number (60610510102).

Almost surely, 2^121221020203 is an apocalyptic number.

121221020203 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221020203 is an equidigital number, since it uses as much as digits as its factorization.

121221020203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 121221020203 its reverse (302020122121), we get a palindrome (423241142324).

The spelling of 121221020203 in words is "one hundred twenty-one billion, two hundred twenty-one million, twenty thousand, two hundred three".