1240204421971 has 2 divisors, whose sum is σ = 1240204421972. Its totient is φ = 1240204421970.

The previous prime is 1240204421941. The next prime is 1240204421977. The reversal of 1240204421971 is 1791244020421.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1240204421971 - 2²⁵ = 1240170867539 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1240204421971.

It is not a weakly prime, because it can be changed into another prime (1240204421977) 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, 620102210985 + 620102210986.

It is an arithmetic number, because the mean of its divisors is an integer number (620102210986).

Almost surely, 2^{1240204421971} is an apocalyptic number.

1240204421971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240204421971 is an equidigital number, since it uses as much as digits as its factorization.

1240204421971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 37.

The spelling of 1240204421971 in words is "one trillion, two hundred forty billion, two hundred four million, four hundred twenty-one thousand, nine hundred seventy-one".