1240412044021 has 2 divisors, whose sum is σ = 1240412044022. Its totient is φ = 1240412044020.

The previous prime is 1240412044019. The next prime is 1240412044049. The reversal of 1240412044021 is 1204402140421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1120868981521 + 119543062500 = 1058711^2 + 345750^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240412044021 - 2¹ = 1240412044019 is a prime.

Together with 1240412044019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240412044121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620206022010 + 620206022011.

It is an arithmetic number, because the mean of its divisors is an integer number (620206022011).

Almost surely, 2^{1240412044021} is an apocalyptic number.

It is an amenable number.

1240412044021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240412044021 is an equidigital number, since it uses as much as digits as its factorization.

1240412044021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 1240412044021 its reverse (1204402140421), we get a palindrome (2444814184442).

The spelling of 1240412044021 in words is "one trillion, two hundred forty billion, four hundred twelve million, forty-four thousand, twenty-one".