121221031120203 has 8 divisors (see below), whose sum is σ = 184717761707008. Its totient is φ = 69269160640104.

The previous prime is 121221031120153. The next prime is 121221031120219. The reversal of 121221031120203 is 302021130122121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121221031120203 - 2²⁰ = 121221030071627 is a prime.

It is a super-2 number, since 2×121221031120203² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 5772430053343 = 121221031120203 / (1 + 2 + 1 + 2 + 2 + 1 + 0 + 3 + 1 + 1 + 2 + 0 + 2 + 0 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121221031120203.

It is not an unprimeable number, because it can be changed into a prime (121221031120003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2886215026651 + ... + 2886215026692.

It is an arithmetic number, because the mean of its divisors is an integer number (23089720213376).

Almost surely, 2^{121221031120203} is an apocalyptic number.

121221031120203 is a deficient number, since it is larger than the sum of its proper divisors (63496730586805).

121221031120203 is an equidigital number, since it uses as much as digits as its factorization.

121221031120203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5772430053353.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 121221031120203 its reverse (302021130122121), we get a palindrome (423242161242324).

The spelling of 121221031120203 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, thirty-one million, one hundred twenty thousand, two hundred three".