21654532 has 48 divisors (see below), whose sum is σ = 42336000. Its totient is φ = 9644544.

The previous prime is 21654497. The next prime is 21654541. The reversal of 21654532 is 23545612.

It is a super-2 number, since 2×21654532² = 937837512278048, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21654532.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155719 + ... + 155857.

It is an arithmetic number, because the mean of its divisors is an integer number (882000).

Almost surely, 2^21654532 is an apocalyptic number.

It is an amenable number.

21654532 is a deficient number, since it is larger than the sum of its proper divisors (20681468).

21654532 is a wasteful number, since it uses less digits than its factorization.

21654532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268 (or 266 counting only the distinct ones).

The product of its digits is 7200, while the sum is 28.

The square root of 21654532 is about 4653.4430264053. The cubic root of 21654532 is about 278.7294989179.

The spelling of 21654532 in words is "twenty-one million, six hundred fifty-four thousand, five hundred thirty-two".