1240204421977 has 2 divisors, whose sum is σ = 1240204421978. Its totient is φ = 1240204421976.

The previous prime is 1240204421971. The next prime is 1240204422019. The reversal of 1240204421977 is 7791244020421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1238466282496 + 1738139481 = 1112864^2 + 41691^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240204421977 - 2⁷ = 1240204421849 is a prime.

It is not a weakly prime, because it can be changed into another prime (1240204421971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620102210988 + 620102210989.

It is an arithmetic number, because the mean of its divisors is an integer number (620102210989).

Almost surely, 2^{1240204421977} is an apocalyptic number.

It is an amenable number.

1240204421977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240204421977 is an equidigital number, since it uses as much as digits as its factorization.

1240204421977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 43.

The spelling of 1240204421977 in words is "one trillion, two hundred forty billion, two hundred four million, four hundred twenty-one thousand, nine hundred seventy-seven".