1220200020221 has 24 divisors (see below), whose sum is σ = 1529673064920. Its totient is φ = 964756662912.

The previous prime is 1220200020199. The next prime is 1220200020241.

1220200020221 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 27931225 + 1220172088996 = 5285^2 + 1104614^2 .

It is not a de Polignac number, because 1220200020221 - 2⁶ = 1220200020157 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1220200020196 and 1220200020205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220200020241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 240035 + ... + 1580511.

It is an arithmetic number, because the mean of its divisors is an integer number (63736377705).

Almost surely, 2^{1220200020221} is an apocalyptic number.

It is an amenable number.

1220200020221 is a deficient number, since it is larger than the sum of its proper divisors (309473044699).

1220200020221 is a wasteful number, since it uses less digits than its factorization.

1220200020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341933 (or 1341926 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

It can be divided in two parts, 12202000 and 20221, that added together give a palindrome (12222221).

The spelling of 1220200020221 in words is "one trillion, two hundred twenty billion, two hundred million, twenty thousand, two hundred twenty-one".