1221302281 has 2 divisors, whose sum is σ = 1221302282. Its totient is φ = 1221302280.

The previous prime is 1221302279. The next prime is 1221302333. The reversal of 1221302281 is 1822031221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1217381881 + 3920400 = 34891^2 + 1980^2 .

It is an emirp because it is prime and its reverse (1822031221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221302281 - 2¹ = 1221302279 is a prime.

It is a super-2 number, since 2×1221302281² = 2983158523151605922, which contains 22 as substring.

Together with 1221302279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1221302081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610651140 + 610651141.

It is an arithmetic number, because the mean of its divisors is an integer number (610651141).

Almost surely, 2^1221302281 is an apocalyptic number.

It is an amenable number.

1221302281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221302281 is an equidigital number, since it uses as much as digits as its factorization.

1221302281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 1221302281 is about 34947.1355192382. The cubic root of 1221302281 is about 1068.9097933002.

The spelling of 1221302281 in words is "one billion, two hundred twenty-one million, three hundred two thousand, two hundred eighty-one".