1220203021231 has 4 divisors (see below), whose sum is σ = 1220205240000. Its totient is φ = 1220200802464.

The previous prime is 1220203021181. The next prime is 1220203021267. The reversal of 1220203021231 is 1321203020221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220203021231 is a prime.

It is a super-2 number, since 2×1220203021231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220203021199 and 1220203021208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220203121231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400770 + ... + 1612768.

It is an arithmetic number, because the mean of its divisors is an integer number (305051310000).

Almost surely, 2^{1220203021231} is an apocalyptic number.

1220203021231 is a deficient number, since it is larger than the sum of its proper divisors (2218769).

1220203021231 is a wasteful number, since it uses less digits than its factorization.

1220203021231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2218768.

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

Adding to 1220203021231 its reverse (1321203020221), we get a palindrome (2541406041452).

The spelling of 1220203021231 in words is "one trillion, two hundred twenty billion, two hundred three million, twenty-one thousand, two hundred thirty-one".