1201210321 has 2 divisors, whose sum is σ = 1201210322. Its totient is φ = 1201210320.

The previous prime is 1201210313. The next prime is 1201210331. The reversal of 1201210321 is 1230121021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1083726400 + 117483921 = 32920^2 + 10839^2 .

It is an emirp because it is prime and its reverse (1230121021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1201210321 - 2³ = 1201210313 is a prime.

It is not a weakly prime, because it can be changed into another prime (1201210331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600605160 + 600605161.

It is an arithmetic number, because the mean of its divisors is an integer number (600605161).

Almost surely, 2^1201210321 is an apocalyptic number.

It is an amenable number.

1201210321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201210321 is an equidigital number, since it uses as much as digits as its factorization.

1201210321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1201210321 is about 34658.4812275437. The cubic root of 1201210321 is about 1063.0157152430.

Adding to 1201210321 its reverse (1230121021), we get a palindrome (2431331342).

The spelling of 1201210321 in words is "one billion, two hundred one million, two hundred ten thousand, three hundred twenty-one".