1243786873421 has 16 divisors (see below), whose sum is σ = 1269816058368. Its totient is φ = 1217854310400.

The previous prime is 1243786873403. The next prime is 1243786873429.

1243786873421 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 1243786873421 - 2¹⁰ = 1243786872397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243786873429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92530061 + ... + 92543501.

It is an arithmetic number, because the mean of its divisors is an integer number (79363503648).

Almost surely, 2^{1243786873421} is an apocalyptic number.

It is an amenable number.

1243786873421 is a deficient number, since it is larger than the sum of its proper divisors (26029184947).

1243786873421 is a wasteful number, since it uses less digits than its factorization.

1243786873421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16892.

The product of its digits is 10838016, while the sum is 56.

The spelling of 1243786873421 in words is "one trillion, two hundred forty-three billion, seven hundred eighty-six million, eight hundred seventy-three thousand, four hundred twenty-one".