1220001020321 has 8 divisors (see below), whose sum is σ = 1222284976704. Its totient is φ = 1217718294640.

The previous prime is 1220001020311. The next prime is 1220001020363. The reversal of 1220001020321 is 1230201000221.

It is a happy number.

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 1220001020321 - 2⁶ = 1220001020257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220001020296 and 1220001020305.

It is not an unprimeable number, because it can be changed into a prime (1220001020311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1688891 + ... + 2300511.

It is an arithmetic number, because the mean of its divisors is an integer number (152785622088).

Almost surely, 2^{1220001020321} is an apocalyptic number.

It is an amenable number.

1220001020321 is a deficient number, since it is larger than the sum of its proper divisors (2283956383).

1220001020321 is an equidigital number, since it uses as much as digits as its factorization.

1220001020321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615351.

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

Adding to 1220001020321 its reverse (1230201000221), we get a palindrome (2450202020542).

The spelling of 1220001020321 in words is "one trillion, two hundred twenty billion, one million, twenty thousand, three hundred twenty-one".