1221296147 has 2 divisors, whose sum is σ = 1221296148. Its totient is φ = 1221296146.

The previous prime is 1221296129. The next prime is 1221296149. The reversal of 1221296147 is 7416921221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221296147 - 2⁸ = 1221295891 is a prime.

It is a super-3 number, since 3×1221296147³ (a number of 28 digits) contains 333 as substring.

Together with 1221296149, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1221296149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610648073 + 610648074.

It is an arithmetic number, because the mean of its divisors is an integer number (610648074).

Almost surely, 2^1221296147 is an apocalyptic number.

1221296147 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221296147 is an equidigital number, since it uses as much as digits as its factorization.

1221296147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 1221296147 is about 34947.0477580010. The cubic root of 1221296147 is about 1068.9080037613.

The spelling of 1221296147 in words is "one billion, two hundred twenty-one million, two hundred ninety-six thousand, one hundred forty-seven".