1221841147 has 2 divisors, whose sum is σ = 1221841148. Its totient is φ = 1221841146.

The previous prime is 1221841133. The next prime is 1221841157. The reversal of 1221841147 is 7411481221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221841147 - 2²⁷ = 1087623419 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221841157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610920573 + 610920574.

It is an arithmetic number, because the mean of its divisors is an integer number (610920574).

Almost surely, 2^1221841147 is an apocalyptic number.

1221841147 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221841147 is an equidigital number, since it uses as much as digits as its factorization.

1221841147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3584, while the sum is 31.

The square root of 1221841147 is about 34954.8443995965. The cubic root of 1221841147 is about 1069.0669791882.

The spelling of 1221841147 in words is "one billion, two hundred twenty-one million, eight hundred forty-one thousand, one hundred forty-seven".