121221110203 has 4 divisors (see below), whose sum is σ = 121223674440. Its totient is φ = 121218545968.

The previous prime is 121221110147. The next prime is 121221110221. The reversal of 121221110203 is 302011122121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121221110203 - 2¹³ = 121221102011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221113203) 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, 1209850 + ... + 1306207.

It is an arithmetic number, because the mean of its divisors is an integer number (30305918610).

Almost surely, 2^121221110203 is an apocalyptic number.

121221110203 is a deficient number, since it is larger than the sum of its proper divisors (2564237).

121221110203 is an equidigital number, since it uses as much as digits as its factorization.

121221110203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2564236.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 121221110203 its reverse (302011122121), we get a palindrome (423232232324).

The spelling of 121221110203 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred ten thousand, two hundred three".