21654422 has 16 divisors (see below), whose sum is σ = 33257952. Its totient is φ = 10570560.

The previous prime is 21654421. The next prime is 21654427. The reversal of 21654422 is 22445612.

It is a junction number, because it is equal to n+sod(n) for n = 21654391 and 21654400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21654421) 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 7 ways as a sum of consecutive naturals, for example, 29423 + ... + 30149.

It is an arithmetic number, because the mean of its divisors is an integer number (2078622).

Almost surely, 2^21654422 is an apocalyptic number.

21654422 is a deficient number, since it is larger than the sum of its proper divisors (11603530).

21654422 is a wasteful number, since it uses less digits than its factorization.

21654422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063.

The product of its digits is 3840, while the sum is 26.

The square root of 21654422 is about 4653.4312071847. The cubic root of 21654422 is about 278.7290269567.

The spelling of 21654422 in words is "twenty-one million, six hundred fifty-four thousand, four hundred twenty-two".