1200220321 has 2 divisors, whose sum is σ = 1200220322. Its totient is φ = 1200220320.

The previous prime is 1200220283. The next prime is 1200220331. The reversal of 1200220321 is 1230220021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1199860321 + 360000 = 34639^2 + 600^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200220321 - 2⁹ = 1200219809 is a prime.

It is not a weakly prime, because it can be changed into another prime (1200220331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600110160 + 600110161.

It is an arithmetic number, because the mean of its divisors is an integer number (600110161).

Almost surely, 2^1200220321 is an apocalyptic number.

It is an amenable number.

1200220321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200220321 is an equidigital number, since it uses as much as digits as its factorization.

1200220321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1200220321 is about 34644.1960651420. The cubic root of 1200220321 is about 1062.7236002025.

Adding to 1200220321 its reverse (1230220021), we get a palindrome (2430440342).

It can be divided in two parts, 12002 and 20321, that added together give a palindrome (32323).

The spelling of 1200220321 in words is "one billion, two hundred million, two hundred twenty thousand, three hundred twenty-one".