11869821 has 12 divisors (see below), whose sum is σ = 17780672. Its totient is φ = 7913052.

The previous prime is 11869811. The next prime is 11869861. The reversal of 11869821 is 12896811.

It is not a de Polignac number, because 11869821 - 2⁵ = 11869789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11869811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24181 + ... + 24666.

Almost surely, 2^11869821 is an apocalyptic number.

It is an amenable number.

11869821 is a deficient number, since it is larger than the sum of its proper divisors (5910851).

11869821 is an frugal number, since it uses more digits than its factorization.

11869821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48862 (or 48850 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 11869821 is about 3445.2606577732. The cubic root of 11869821 is about 228.1119602480. Note that the first 3 decimals are identical.

The spelling of 11869821 in words is "eleven million, eight hundred sixty-nine thousand, eight hundred twenty-one".