11780021 has 8 divisors (see below), whose sum is σ = 12879264. Its totient is φ = 10685520.

The previous prime is 11780011. The next prime is 11780029. The reversal of 11780021 is 12008711.

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

It is a cyclic number.

It is not a de Polignac number, because 11780021 - 2¹⁰ = 11778997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11779975 and 11780002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11780029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5870 + ... + 7616.

It is an arithmetic number, because the mean of its divisors is an integer number (1609908).

Almost surely, 2^11780021 is an apocalyptic number.

11780021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11780021 is a deficient number, since it is larger than the sum of its proper divisors (1099243).

11780021 is a wasteful number, since it uses less digits than its factorization.

11780021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2371.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 11780021 is about 3432.2035196066. The cubic root of 11780021 is about 227.5352503443.

Adding to 11780021 its reverse (12008711), we get a palindrome (23788732).

The spelling of 11780021 in words is "eleven million, seven hundred eighty thousand, twenty-one".