1220140321 has 2 divisors, whose sum is σ = 1220140322. Its totient is φ = 1220140320.

The previous prime is 1220140319. The next prime is 1220140349. The reversal of 1220140321 is 1230410221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 759608721 + 460531600 = 27561^2 + 21460^2 .

It is an emirp because it is prime and its reverse (1230410221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1220140321 - 2¹ = 1220140319 is a prime.

Together with 1220140319, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1220140295 and 1220140304.

It is not a weakly prime, because it can be changed into another prime (1220140381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610070160 + 610070161.

It is an arithmetic number, because the mean of its divisors is an integer number (610070161).

Almost surely, 2^1220140321 is an apocalyptic number.

It is an amenable number.

1220140321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220140321 is an equidigital number, since it uses as much as digits as its factorization.

1220140321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1220140321 is about 34930.5070246626. The cubic root of 1220140321 is about 1068.5706950156.

Adding to 1220140321 its reverse (1230410221), we get a palindrome (2450550542).

The spelling of 1220140321 in words is "one billion, two hundred twenty million, one hundred forty thousand, three hundred twenty-one".