1284229021 has 2 divisors, whose sum is σ = 1284229022. Its totient is φ = 1284229020.

The previous prime is 1284228983. The next prime is 1284229049. The reversal of 1284229021 is 1209224821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1284147225 + 81796 = 35835^2 + 286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1284229021 is a prime.

It is a super-5 number, since 5×1284229021⁵ (a number of 47 digits) contains 55555 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1284229321) 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, 642114510 + 642114511.

It is an arithmetic number, because the mean of its divisors is an integer number (642114511).

Almost surely, 2^1284229021 is an apocalyptic number.

It is an amenable number.

1284229021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1284229021 is an equidigital number, since it uses as much as digits as its factorization.

1284229021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 1284229021 is about 35836.1412682783. The cubic root of 1284229021 is about 1086.9614955948.

The spelling of 1284229021 in words is "one billion, two hundred eighty-four million, two hundred twenty-nine thousand, twenty-one".