21654832 has 20 divisors (see below), whose sum is σ = 44165080. Its totient is φ = 10257408.

The previous prime is 21654811. The next prime is 21654839. The reversal of 21654832 is 23845612.

It is a junction number, because it is equal to n+sod(n) for n = 21654794 and 21654803.

It is not an unprimeable number, because it can be changed into a prime (21654839) 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 3 ways as a sum of consecutive naturals, for example, 35313 + ... + 35920.

It is an arithmetic number, because the mean of its divisors is an integer number (2208254).

Almost surely, 2^21654832 is an apocalyptic number.

It is an amenable number.

21654832 is an abundant number, since it is smaller than the sum of its proper divisors (22510248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21654832 is a wasteful number, since it uses less digits than its factorization.

21654832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71260 (or 71254 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 21654832 is about 4653.4752604908. The cubic root of 21654832 is about 278.7307860767.

The spelling of 21654832 in words is "twenty-one million, six hundred fifty-four thousand, eight hundred thirty-two".