1201421321 has 2 divisors, whose sum is σ = 1201421322. Its totient is φ = 1201421320.

The previous prime is 1201421303. The next prime is 1201421323. The reversal of 1201421321 is 1231241021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 654796921 + 546624400 = 25589^2 + 23380^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201421321 - 2⁶ = 1201421257 is a prime.

Together with 1201421323, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1201421321.

It is not a weakly prime, because it can be changed into another prime (1201421323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600710660 + 600710661.

It is an arithmetic number, because the mean of its divisors is an integer number (600710661).

Almost surely, 2^1201421321 is an apocalyptic number.

It is an amenable number.

1201421321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201421321 is an equidigital number, since it uses as much as digits as its factorization.

1201421321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1201421321 is about 34661.5250818541. The cubic root of 1201421321 is about 1063.0779533541.

Adding to 1201421321 its reverse (1231241021), we get a palindrome (2432662342).

The spelling of 1201421321 in words is "one billion, two hundred one million, four hundred twenty-one thousand, three hundred twenty-one".