12721440111 has 8 divisors (see below), whose sum is σ = 17249410560. Its totient is φ = 8337214872.

The previous prime is 12721440103. The next prime is 12721440113. The reversal of 12721440111 is 11104412721.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12721440111 - 2³ = 12721440103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12721440113) 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 in 7 ways as a sum of consecutive naturals, for example, 35936095 + ... + 35936448.

It is an arithmetic number, because the mean of its divisors is an integer number (2156176320).

Almost surely, 2^12721440111 is an apocalyptic number.

12721440111 is a deficient number, since it is larger than the sum of its proper divisors (4527970449).

12721440111 is an equidigital number, since it uses as much as digits as its factorization.

12721440111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71872605.

The product of its (nonzero) digits is 448, while the sum is 24.

Adding to 12721440111 its reverse (11104412721), we get a palindrome (23825852832).

The spelling of 12721440111 in words is "twelve billion, seven hundred twenty-one million, four hundred forty thousand, one hundred eleven".