1041239821 has 2 divisors, whose sum is σ = 1041239822. Its totient is φ = 1041239820.

The previous prime is 1041239803. The next prime is 1041239887. The reversal of 1041239821 is 1289321401.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1005777796 + 35462025 = 31714^2 + 5955^2 .

It is a cyclic number.

It is not a de Polignac number, because 1041239821 - 2⁵ = 1041239789 is a prime.

It is a super-2 number, since 2×1041239821² = 2168360729672224082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1041239891) 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, 520619910 + 520619911.

It is an arithmetic number, because the mean of its divisors is an integer number (520619911).

Almost surely, 2^1041239821 is an apocalyptic number.

It is an amenable number.

1041239821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1041239821 is an equidigital number, since it uses as much as digits as its factorization.

1041239821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 1041239821 is about 32268.2478762018. The cubic root of 1041239821 is about 1013.5618517285.

The spelling of 1041239821 in words is "one billion, forty-one million, two hundred thirty-nine thousand, eight hundred twenty-one".