1254943434821 has 4 divisors (see below), whose sum is σ = 1254962653644. Its totient is φ = 1254924216000.

The previous prime is 1254943434803. The next prime is 1254943434839. The reversal of 1254943434821 is 1284343494521.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1254943434803) and next prime (1254943434839).

It can be written as a sum of positive squares in 2 ways, for example, as 319806084196 + 935137350625 = 565514^2 + 967025^2 .

It is a cyclic number.

It is not a de Polignac number, because 1254943434821 - 2⁶ = 1254943434757 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1254943434821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1254943434881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9511130 + ... + 9642171.

It is an arithmetic number, because the mean of its divisors is an integer number (313740663411).

Almost surely, 2^{1254943434821} is an apocalyptic number.

It is an amenable number.

1254943434821 is a deficient number, since it is larger than the sum of its proper divisors (19218823).

1254943434821 is an equidigital number, since it uses as much as digits as its factorization.

1254943434821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19218822.

The product of its digits is 3317760, while the sum is 50.

The spelling of 1254943434821 in words is "one trillion, two hundred fifty-four billion, nine hundred forty-three million, four hundred thirty-four thousand, eight hundred twenty-one".