1220431140221 has 4 divisors (see below), whose sum is σ = 1228204587132. Its totient is φ = 1212657693312.

The previous prime is 1220431140191. The next prime is 1220431140223. The reversal of 1220431140221 is 1220411340221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 162156014596 + 1058275125625 = 402686^2 + 1028725^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220431140221 - 2³⁰ = 1219357398397 is a prime.

It is a super-2 number, since 2×1220431140221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220431140223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3886723220 + ... + 3886723533.

It is an arithmetic number, because the mean of its divisors is an integer number (307051146783).

Almost surely, 2^{1220431140221} is an apocalyptic number.

It is an amenable number.

1220431140221 is a deficient number, since it is larger than the sum of its proper divisors (7773446911).

1220431140221 is an equidigital number, since it uses as much as digits as its factorization.

1220431140221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7773446910.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 1220431140221 its reverse (1220411340221), we get a palindrome (2440842480442).

The spelling of 1220431140221 in words is "one trillion, two hundred twenty billion, four hundred thirty-one million, one hundred forty thousand, two hundred twenty-one".