202221212221021 has 4 divisors (see below), whose sum is σ = 231109956824032. Its totient is φ = 173332467618012.

The previous prime is 202221212220991. The next prime is 202221212221097. The reversal of 202221212221021 is 120122212122202.

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 202221212221021 - 2²⁵ = 202221178666589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202221212220983 and 202221212221001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202221216221021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14444372301495 + ... + 14444372301508.

It is an arithmetic number, because the mean of its divisors is an integer number (57777489206008).

Almost surely, 2^{202221212221021} is an apocalyptic number.

It is an amenable number.

202221212221021 is a deficient number, since it is larger than the sum of its proper divisors (28888744603011).

202221212221021 is an equidigital number, since it uses as much as digits as its factorization.

202221212221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28888744603010.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 202221212221021 its reverse (120122212122202), we get a palindrome (322343424343223).

The spelling of 202221212221021 in words is "two hundred two trillion, two hundred twenty-one billion, two hundred twelve million, two hundred twenty-one thousand, twenty-one".