1215421147 has 2 divisors, whose sum is σ = 1215421148. Its totient is φ = 1215421146.

The previous prime is 1215421121. The next prime is 1215421159. The reversal of 1215421147 is 7411245121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215421147 is a prime.

It is not a weakly prime, because it can be changed into another prime (1215421447) 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, 607710573 + 607710574.

It is an arithmetic number, because the mean of its divisors is an integer number (607710574).

Almost surely, 2^1215421147 is an apocalyptic number.

1215421147 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215421147 is an equidigital number, since it uses as much as digits as its factorization.

1215421147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2240, while the sum is 28.

The square root of 1215421147 is about 34862.8906862297. The cubic root of 1215421147 is about 1067.1912672236.

Adding to 1215421147 its reverse (7411245121), we get a palindrome (8626666268).

The spelling of 1215421147 in words is "one billion, two hundred fifteen million, four hundred twenty-one thousand, one hundred forty-seven".