1220023321 has 16 divisors (see below), whose sum is σ = 1403117568. Its totient is φ = 1050483600.

The previous prime is 1220023319. The next prime is 1220023331. The reversal of 1220023321 is 1233200221.

It is a cyclic number.

It is not a de Polignac number, because 1220023321 - 2¹ = 1220023319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220023295 and 1220023304.

It is not an unprimeable number, because it can be changed into a prime (1220023331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22035 + ... + 54088.

It is an arithmetic number, because the mean of its divisors is an integer number (87694848).

Almost surely, 2^1220023321 is an apocalyptic number.

1220023321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220023321 is a deficient number, since it is larger than the sum of its proper divisors (183094247).

1220023321 is a wasteful number, since it uses less digits than its factorization.

1220023321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76212.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1220023321 is about 34928.8322306945. The cubic root of 1220023321 is about 1068.5365386251.

Adding to 1220023321 its reverse (1233200221), we get a palindrome (2453223542).

Subtracting 1220023321 from its reverse (1233200221), we obtain a square (13176900 = 3630²).

The spelling of 1220023321 in words is "one billion, two hundred twenty million, twenty-three thousand, three hundred twenty-one".