202220243021 has 4 divisors (see below), whose sum is σ = 214115551452. Its totient is φ = 190324934592.

The previous prime is 202220243003. The next prime is 202220243059. The reversal of 202220243021 is 120342022202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120342022202 = 2 ⋅60171011101.

It can be written as a sum of positive squares in 2 ways, for example, as 79405040521 + 122815202500 = 281789^2 + 350450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202220243021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202220242984 and 202220243002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202220243221) 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, 5947654190 + ... + 5947654223.

It is an arithmetic number, because the mean of its divisors is an integer number (53528887863).

Almost surely, 2^202220243021 is an apocalyptic number.

It is an amenable number.

202220243021 is a deficient number, since it is larger than the sum of its proper divisors (11895308431).

202220243021 is a wasteful number, since it uses less digits than its factorization.

202220243021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11895308430.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 202220243021 its reverse (120342022202), we get a palindrome (322562265223).

The spelling of 202220243021 in words is "two hundred two billion, two hundred twenty million, two hundred forty-three thousand, twenty-one".