222201210421 has 2 divisors, whose sum is σ = 222201210422. Its totient is φ = 222201210420.

The previous prime is 222201210419. The next prime is 222201210433. The reversal of 222201210421 is 124012102222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218569340196 + 3631870225 = 467514^2 + 60265^2 .

It is a cyclic number.

It is not a de Polignac number, because 222201210421 - 2¹ = 222201210419 is a prime.

Together with 222201210419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222201210481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111100605210 + 111100605211.

It is an arithmetic number, because the mean of its divisors is an integer number (111100605211).

Almost surely, 2^222201210421 is an apocalyptic number.

It is an amenable number.

222201210421 is a deficient number, since it is larger than the sum of its proper divisors (1).

222201210421 is an equidigital number, since it uses as much as digits as its factorization.

222201210421 is an odious number, because the sum of its binary digits is odd.

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

Adding to 222201210421 its reverse (124012102222), we get a palindrome (346213312643).

The spelling of 222201210421 in words is "two hundred twenty-two billion, two hundred one million, two hundred ten thousand, four hundred twenty-one".