202122221221 has 4 divisors (see below), whose sum is σ = 202191993612. Its totient is φ = 202052448832.

The previous prime is 202122221207. The next prime is 202122221267. The reversal of 202122221221 is 122122221202.

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 62908164225 + 139214056996 = 250815^2 + 373114^2 .

It is a cyclic number.

It is not a de Polignac number, because 202122221221 - 2¹⁵ = 202122188453 is a prime.

It is a super-2 number, since 2×202122221221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202122221321) 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, 34881850 + ... + 34887643.

It is an arithmetic number, because the mean of its divisors is an integer number (50547998403).

Almost surely, 2^202122221221 is an apocalyptic number.

It is an amenable number.

202122221221 is a deficient number, since it is larger than the sum of its proper divisors (69772391).

202122221221 is an equidigital number, since it uses as much as digits as its factorization.

202122221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69772390.

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

Subtracting from 202122221221 its sum of digits (19), we obtain a palindrome (202122221202).

Adding to 202122221221 its reverse (122122221202), we get a palindrome (324244442423).

The spelling of 202122221221 in words is "two hundred two billion, one hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty-one".