1220203320121 has 4 divisors (see below), whose sum is σ = 1220419023732. Its totient is φ = 1219987616512.

The previous prime is 1220203320073. The next prime is 1220203320169. The reversal of 1220203320121 is 1210233020221.

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

It is an interprime number because it is at equal distance from previous prime (1220203320073) and next prime (1220203320169).

It can be written as a sum of positive squares in 2 ways, for example, as 40240360000 + 1179962960121 = 200600^2 + 1086261^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220203320121 - 2¹⁵ = 1220203287353 is a prime.

It is a super-2 number, since 2×1220203320121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220203320191) 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, 107843320 + ... + 107854633.

It is an arithmetic number, because the mean of its divisors is an integer number (305104755933).

Almost surely, 2^{1220203320121} is an apocalyptic number.

It is an amenable number.

1220203320121 is a deficient number, since it is larger than the sum of its proper divisors (215703611).

1220203320121 is an equidigital number, since it uses as much as digits as its factorization.

1220203320121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215703610.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 1220203320121 its reverse (1210233020221), we get a palindrome (2430436340342).

The spelling of 1220203320121 in words is "one trillion, two hundred twenty billion, two hundred three million, three hundred twenty thousand, one hundred twenty-one".