11905621 has 16 divisors (see below), whose sum is σ = 15015168. Its totient is φ = 9187200.

The previous prime is 11905613. The next prime is 11905639. The reversal of 11905621 is 12650911.

It is a cyclic number.

It is not a de Polignac number, because 11905621 - 2³ = 11905613 is a prime.

It is a super-2 number, since 2×11905621² = 283487622791282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11905681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2136 + ... + 5326.

It is an arithmetic number, because the mean of its divisors is an integer number (938448).

Almost surely, 2^11905621 is an apocalyptic number.

It is an amenable number.

11905621 is a deficient number, since it is larger than the sum of its proper divisors (3109547).

11905621 is a wasteful number, since it uses less digits than its factorization.

11905621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3252.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 11905621 is about 3450.4522891934. The cubic root of 11905621 is about 228.3410626021.

The spelling of 11905621 in words is "eleven million, nine hundred five thousand, six hundred twenty-one".