1221041363 has 2 divisors, whose sum is σ = 1221041364. Its totient is φ = 1221041362.

The previous prime is 1221041359. The next prime is 1221041429. The reversal of 1221041363 is 3631401221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221041363 - 2² = 1221041359 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221041323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610520681 + 610520682.

It is an arithmetic number, because the mean of its divisors is an integer number (610520682).

Almost surely, 2^1221041363 is an apocalyptic number.

1221041363 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221041363 is an equidigital number, since it uses as much as digits as its factorization.

1221041363 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 1221041363 is about 34943.4022814036. The cubic root of 1221041363 is about 1068.8336675468.

Adding to 1221041363 its reverse (3631401221), we get a palindrome (4852442584).

The spelling of 1221041363 in words is "one billion, two hundred twenty-one million, forty-one thousand, three hundred sixty-three".