202220012021221 has 4 divisors (see below), whose sum is σ = 202223399748012. Its totient is φ = 202216624294432.

The previous prime is 202220012021177. The next prime is 202220012021233. The reversal of 202220012021221 is 122120210022202.

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 37354771541025 + 164865240480196 = 6111855^2 + 12839986^2 .

It is a cyclic number.

It is not a de Polignac number, because 202220012021221 - 2¹³ = 202220012013029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202220012022221) 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, 1693773856 + ... + 1693893241.

It is an arithmetic number, because the mean of its divisors is an integer number (50555849937003).

Almost surely, 2^{202220012021221} is an apocalyptic number.

It is an amenable number.

202220012021221 is a deficient number, since it is larger than the sum of its proper divisors (3387726791).

202220012021221 is an equidigital number, since it uses as much as digits as its factorization.

202220012021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3387726790.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 202220012021221 its reverse (122120210022202), we get a palindrome (324340222043423).

The spelling of 202220012021221 in words is "two hundred two trillion, two hundred twenty billion, twelve million, twenty-one thousand, two hundred twenty-one".