1427097821 has 2 divisors, whose sum is σ = 1427097822. Its totient is φ = 1427097820.

The previous prime is 1427097811. The next prime is 1427097871. The reversal of 1427097821 is 1287907241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1365302500 + 61795321 = 36950^2 + 7861^2 .

It is a cyclic number.

It is not a de Polignac number, because 1427097821 - 2⁶ = 1427097757 is a prime.

It is a super-3 number, since 3×1427097821³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1427097811) 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, 713548910 + 713548911.

It is an arithmetic number, because the mean of its divisors is an integer number (713548911).

Almost surely, 2^1427097821 is an apocalyptic number.

It is an amenable number.

1427097821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1427097821 is an equidigital number, since it uses as much as digits as its factorization.

1427097821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 1427097821 is about 37776.9482753703. The cubic root of 1427097821 is about 1125.8604961532.

The spelling of 1427097821 in words is "one billion, four hundred twenty-seven million, ninety-seven thousand, eight hundred twenty-one".