11421243993 has 4 divisors (see below), whose sum is σ = 15228325328. Its totient is φ = 7614162660.

The previous prime is 11421243991. The next prime is 11421244019. The reversal of 11421243993 is 39934212411.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39934212411 = 3 ⋅13311404137.

It is not a de Polignac number, because 11421243993 - 2¹ = 11421243991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11421243991) 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, 1903540663 + ... + 1903540668.

It is an arithmetic number, because the mean of its divisors is an integer number (3807081332).

Almost surely, 2^11421243993 is an apocalyptic number.

It is an amenable number.

11421243993 is a deficient number, since it is larger than the sum of its proper divisors (3807081335).

11421243993 is an equidigital number, since it uses as much as digits as its factorization.

11421243993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3807081334.

The product of its digits is 46656, while the sum is 39.

The spelling of 11421243993 in words is "eleven billion, four hundred twenty-one million, two hundred forty-three thousand, nine hundred ninety-three".