1021201243 has 2 divisors, whose sum is σ = 1021201244. Its totient is φ = 1021201242.

The previous prime is 1021201241. The next prime is 1021201253. The reversal of 1021201243 is 3421021201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021201243 - 2¹ = 1021201241 is a prime.

Together with 1021201241, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1021201241) 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 as a sum of consecutive naturals, namely, 510600621 + 510600622.

It is an arithmetic number, because the mean of its divisors is an integer number (510600622).

Almost surely, 2^1021201243 is an apocalyptic number.

1021201243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021201243 is an equidigital number, since it uses as much as digits as its factorization.

1021201243 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 1021201243 is about 31956.2395002916. The cubic root of 1021201243 is about 1007.0177174383.

Adding to 1021201243 its reverse (3421021201), we get a palindrome (4442222444).

The spelling of 1021201243 in words is "one billion, twenty-one million, two hundred one thousand, two hundred forty-three".