1020220020221 has 4 divisors (see below), whose sum is σ = 1020669656700. Its totient is φ = 1019770383744.

The previous prime is 1020220020217. The next prime is 1020220020229. The reversal of 1020220020221 is 1220200220201.

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 559674556996 + 460545463225 = 748114^2 + 678635^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020220020221 - 2² = 1020220020217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020220020196 and 1020220020205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020220020229) 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, 224814836 + ... + 224819373.

It is an arithmetic number, because the mean of its divisors is an integer number (255167414175).

Almost surely, 2^{1020220020221} is an apocalyptic number.

It is an amenable number.

1020220020221 is a deficient number, since it is larger than the sum of its proper divisors (449636479).

1020220020221 is an equidigital number, since it uses as much as digits as its factorization.

1020220020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449636478.

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

Adding to 1020220020221 its reverse (1220200220201), we get a palindrome (2240420240422).

The spelling of 1020220020221 in words is "one trillion, twenty billion, two hundred twenty million, twenty thousand, two hundred twenty-one".