221223001 has 2 divisors, whose sum is σ = 221223002. Its totient is φ = 221223000.

The previous prime is 221222987. The next prime is 221223029. The reversal of 221223001 is 100322122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161315401 + 59907600 = 12701^2 + 7740^2 .

It is a cyclic number.

It is not a de Polignac number, because 221223001 - 2¹³ = 221214809 is a prime.

It is not a weakly prime, because it can be changed into another prime (221223701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110611500 + 110611501.

It is an arithmetic number, because the mean of its divisors is an integer number (110611501).

Almost surely, 2^221223001 is an apocalyptic number.

It is an amenable number.

221223001 is a deficient number, since it is larger than the sum of its proper divisors (1).

221223001 is an equidigital number, since it uses as much as digits as its factorization.

221223001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 221223001 is about 14873.5671914978. The cubic root of 221223001 is about 604.7976474196.

Adding to 221223001 its reverse (100322122), we get a palindrome (321545123).

The spelling of 221223001 in words is "two hundred twenty-one million, two hundred twenty-three thousand, one".