11980291821 has 4 divisors (see below), whose sum is σ = 15973722432. Its totient is φ = 7986861212.

The previous prime is 11980291783. The next prime is 11980291823. The reversal of 11980291821 is 12819208911.

It is a happy number.

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: 12819208911 = 3 ⋅4273069637.

It is a cyclic number.

It is not a de Polignac number, because 11980291821 - 2¹³ = 11980283629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11980291823) 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 3 ways as a sum of consecutive naturals, for example, 1996715301 + ... + 1996715306.

It is an arithmetic number, because the mean of its divisors is an integer number (3993430608).

Almost surely, 2^11980291821 is an apocalyptic number.

It is an amenable number.

11980291821 is a deficient number, since it is larger than the sum of its proper divisors (3993430611).

11980291821 is an equidigital number, since it uses as much as digits as its factorization.

11980291821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3993430610.

The product of its (nonzero) digits is 20736, while the sum is 42.

The spelling of 11980291821 in words is "eleven billion, nine hundred eighty million, two hundred ninety-one thousand, eight hundred twenty-one".