1220020200221 has 4 divisors (see below), whose sum is σ = 1220065646844. Its totient is φ = 1219974753600.

The previous prime is 1220020200187. The next prime is 1220020200241.

1220020200221 is nontrivially palindromic in base 10.

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 665873952121 + 554146248100 = 816011^2 + 744410^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220020200221 - 2¹⁰ = 1220020199197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220020200196 and 1220020200205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220020200241) 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, 22683020 + ... + 22736741.

It is an arithmetic number, because the mean of its divisors is an integer number (305016411711).

Almost surely, 2^{1220020200221} is an apocalyptic number.

It is an amenable number.

1220020200221 is a deficient number, since it is larger than the sum of its proper divisors (45446623).

1220020200221 is an equidigital number, since it uses as much as digits as its factorization.

1220020200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45446622.

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

It can be divided in two parts, 1220020 and 200221, that added together give a palindrome (1420241).

The spelling of 1220020200221 in words is "one trillion, two hundred twenty billion, twenty million, two hundred thousand, two hundred twenty-one".