1227006821 has 2 divisors, whose sum is σ = 1227006822. Its totient is φ = 1227006820.

The previous prime is 1227006811. The next prime is 1227006827. The reversal of 1227006821 is 1286007221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 681784321 + 545222500 = 26111^2 + 23350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1227006821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1227006827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613503410 + 613503411.

It is an arithmetic number, because the mean of its divisors is an integer number (613503411).

Almost surely, 2^1227006821 is an apocalyptic number.

It is an amenable number.

1227006821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1227006821 is an equidigital number, since it uses as much as digits as its factorization.

1227006821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 1227006821 is about 35028.6571395479. The cubic root of 1227006821 is about 1070.5714538555.

The spelling of 1227006821 in words is "one billion, two hundred twenty-seven million, six thousand, eight hundred twenty-one".