1223221001 has 4 divisors (see below), whose sum is σ = 1223673600. Its totient is φ = 1222768404.

The previous prime is 1223220997. The next prime is 1223221031. The reversal of 1223221001 is 1001223221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1001223221 = 19 ⋅52695959.

It is a cyclic number.

It is not a de Polignac number, because 1223221001 - 2² = 1223220997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223221031) 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, 222221 + ... + 227658.

It is an arithmetic number, because the mean of its divisors is an integer number (305918400).

Almost surely, 2^1223221001 is an apocalyptic number.

It is an amenable number.

1223221001 is a deficient number, since it is larger than the sum of its proper divisors (452599).

1223221001 is an equidigital number, since it uses as much as digits as its factorization.

1223221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452598.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1223221001 is about 34974.5764949341. The cubic root of 1223221001 is about 1069.4692686320.

Adding to 1223221001 its reverse (1001223221), we get a palindrome (2224444222).

It can be divided in two parts, 12232 and 21001, that added together give a palindrome (33233).

The spelling of 1223221001 in words is "one billion, two hundred twenty-three million, two hundred twenty-one thousand, one".