1221354263 has 2 divisors, whose sum is σ = 1221354264. Its totient is φ = 1221354262.

The previous prime is 1221354187. The next prime is 1221354271. The reversal of 1221354263 is 3624531221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221354263 - 2¹⁶ = 1221288727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221354293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610677131 + 610677132.

It is an arithmetic number, because the mean of its divisors is an integer number (610677132).

Almost surely, 2^1221354263 is an apocalyptic number.

1221354263 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221354263 is an equidigital number, since it uses as much as digits as its factorization.

1221354263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 29.

The square root of 1221354263 is about 34947.8792346546. The cubic root of 1221354263 is about 1068.9249583366.

Adding to 1221354263 its reverse (3624531221), we get a palindrome (4845885484).

The spelling of 1221354263 in words is "one billion, two hundred twenty-one million, three hundred fifty-four thousand, two hundred sixty-three".