202212222221 has 4 divisors (see below), whose sum is σ = 209185057500. Its totient is φ = 195239386944.

The previous prime is 202212222211. The next prime is 202212222283. The reversal of 202212222221 is 122222212202.

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 138715278025 + 63496944196 = 372445^2 + 251986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202212222221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202212222193 and 202212222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202212222211) 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, 3486417596 + ... + 3486417653.

It is an arithmetic number, because the mean of its divisors is an integer number (52296264375).

Almost surely, 2^202212222221 is an apocalyptic number.

It is an amenable number.

202212222221 is a deficient number, since it is larger than the sum of its proper divisors (6972835279).

202212222221 is an equidigital number, since it uses as much as digits as its factorization.

202212222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6972835278.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 202212222221 its reverse (122222212202), we get a palindrome (324434434423).

The spelling of 202212222221 in words is "two hundred two billion, two hundred twelve million, two hundred twenty-two thousand, two hundred twenty-one".