1220323021 has 8 divisors (see below), whose sum is σ = 1240170624. Its totient is φ = 1200598080.

The previous prime is 1220323009. The next prime is 1220323031. The reversal of 1220323021 is 1203230221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220323021 - 2¹¹ = 1220320973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220322986 and 1220323004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220323031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10501 + ... + 50506.

It is an arithmetic number, because the mean of its divisors is an integer number (155021328).

Almost surely, 2^1220323021 is an apocalyptic number.

It is an amenable number.

1220323021 is a deficient number, since it is larger than the sum of its proper divisors (19847603).

1220323021 is an equidigital number, since it uses as much as digits as its factorization.

1220323021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61331.

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

The square root of 1220323021 is about 34933.1221192724. The cubic root of 1220323021 is about 1068.6240271663.

Adding to 1220323021 its reverse (1203230221), we get a palindrome (2423553242).

It can be divided in two parts, 1 and 220323021, that added together give a palindrome (220323022).

The spelling of 1220323021 in words is "one billion, two hundred twenty million, three hundred twenty-three thousand, twenty-one".