21648141 has 12 divisors (see below), whose sum is σ = 32428032. Its totient is φ = 14431932.

The previous prime is 21648139. The next prime is 21648149. The reversal of 21648141 is 14184612.

It is a happy number.

21648141 is a `hidden beast` number, since 2 + 1 + 648 + 14 + 1 = 666.

It is not a de Polignac number, because 21648141 - 2¹ = 21648139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21648149) 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 11 ways as a sum of consecutive naturals, for example, 44301 + ... + 44786.

It is an arithmetic number, because the mean of its divisors is an integer number (2702336).

Almost surely, 2^21648141 is an apocalyptic number.

It is an amenable number.

21648141 is a deficient number, since it is larger than the sum of its proper divisors (10779891).

21648141 is an frugal number, since it uses more digits than its factorization.

21648141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89102 (or 89090 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 21648141 is about 4652.7562798840. The cubic root of 21648141 is about 278.7020753205.

The spelling of 21648141 in words is "twenty-one million, six hundred forty-eight thousand, one hundred forty-one".