11650821 has 16 divisors (see below), whose sum is σ = 19119744. Its totient is φ = 6145344.

The previous prime is 11650801. The next prime is 11650829. The reversal of 11650821 is 12805611.

It is not a de Polignac number, because 11650821 - 2¹¹ = 11648773 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11650791 and 11650800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11650829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21066 + ... + 21611.

It is an arithmetic number, because the mean of its divisors is an integer number (1194984).

Almost surely, 2^11650821 is an apocalyptic number.

It is an amenable number.

11650821 is a deficient number, since it is larger than the sum of its proper divisors (7468923).

11650821 is a wasteful number, since it uses less digits than its factorization.

11650821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42700.

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 11650821 is about 3413.3298990868. The cubic root of 11650821 is about 226.7003426993.

The spelling of 11650821 in words is "eleven million, six hundred fifty thousand, eight hundred twenty-one".