1020202020221 has 4 divisors (see below), whose sum is σ = 1020240223872. Its totient is φ = 1020163816572.

The previous prime is 1020202020209. The next prime is 1020202020247. The reversal of 1020202020221 is 1220202020201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1020202020221 - 2⁶ = 1020202020157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020202020196 and 1020202020205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010202020221) 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, 19061741 + ... + 19115186.

It is an arithmetic number, because the mean of its divisors is an integer number (255060055968).

Almost surely, 2^{1020202020221} is an apocalyptic number.

It is an amenable number.

1020202020221 is a deficient number, since it is larger than the sum of its proper divisors (38203651).

1020202020221 is an equidigital number, since it uses as much as digits as its factorization.

1020202020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38203650.

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

Adding to 1020202020221 its reverse (1220202020201), we get a palindrome (2240404040422).

The spelling of 1020202020221 in words is "one trillion, twenty billion, two hundred two million, twenty thousand, two hundred twenty-one".