221223222001 has 2 divisors, whose sum is σ = 221223222002. Its totient is φ = 221223222000.

The previous prime is 221223221983. The next prime is 221223222007. The reversal of 221223222001 is 100222322122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220734590976 + 488631025 = 469824^2 + 22105^2 .

It is a cyclic number.

It is not a de Polignac number, because 221223222001 - 2¹⁹ = 221222697713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221223222001.

It is not a weakly prime, because it can be changed into another prime (221223222007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110611611000 + 110611611001.

It is an arithmetic number, because the mean of its divisors is an integer number (110611611001).

Almost surely, 2^221223222001 is an apocalyptic number.

It is an amenable number.

221223222001 is a deficient number, since it is larger than the sum of its proper divisors (1).

221223222001 is an equidigital number, since it uses as much as digits as its factorization.

221223222001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 221223222001 its reverse (100222322122), we get a palindrome (321445544123).

The spelling of 221223222001 in words is "two hundred twenty-one billion, two hundred twenty-three million, two hundred twenty-two thousand, one".