1220321001 has 4 divisors (see below), whose sum is σ = 1627094672. Its totient is φ = 813547332.

The previous prime is 1220320991. The next prime is 1220321017. The reversal of 1220321001 is 1001230221.

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: 1001230221 = 3 ⋅333743407.

It is not a de Polignac number, because 1220321001 - 2⁹ = 1220320489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220321101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203386831 + ... + 203386836.

It is an arithmetic number, because the mean of its divisors is an integer number (406773668).

Almost surely, 2^1220321001 is an apocalyptic number.

It is an amenable number.

1220321001 is a deficient number, since it is larger than the sum of its proper divisors (406773671).

1220321001 is an equidigital number, since it uses as much as digits as its factorization.

1220321001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406773670.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1220321001 is about 34933.0932068719. The cubic root of 1220321001 is about 1068.6234375351.

Adding to 1220321001 its reverse (1001230221), we get a palindrome (2221551222).

The spelling of 1220321001 in words is "one billion, two hundred twenty million, three hundred twenty-one thousand, one".