222621601 has 2 divisors, whose sum is σ = 222621602. Its totient is φ = 222621600.

The previous prime is 222621599. The next prime is 222621611. The reversal of 222621601 is 106126222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211731601 + 10890000 = 14551^2 + 3300^2 .

It is a cyclic number.

It is not a de Polignac number, because 222621601 - 2¹ = 222621599 is a prime.

Together with 222621599, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (222621611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111310800 + 111310801.

It is an arithmetic number, because the mean of its divisors is an integer number (111310801).

Almost surely, 2^222621601 is an apocalyptic number.

It is an amenable number.

222621601 is a deficient number, since it is larger than the sum of its proper divisors (1).

222621601 is an equidigital number, since it uses as much as digits as its factorization.

222621601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 222621601 is about 14920.5094081938. The cubic root of 222621601 is about 606.0695068172.

Adding to 222621601 its reverse (106126222), we get a palindrome (328747823).

The spelling of 222621601 in words is "two hundred twenty-two million, six hundred twenty-one thousand, six hundred one".