21552562 has 8 divisors (see below), whose sum is σ = 32368896. Its totient is φ = 10762932.

The previous prime is 21552551. The next prime is 21552563. The reversal of 21552562 is 26525512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21552562.

It is not an unprimeable number, because it can be changed into a prime (21552563) 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 3 ways as a sum of consecutive naturals, for example, 4518 + ... + 7969.

It is an arithmetic number, because the mean of its divisors is an integer number (4046112).

Almost surely, 2^21552562 is an apocalyptic number.

21552562 is a deficient number, since it is larger than the sum of its proper divisors (10816334).

21552562 is a wasteful number, since it uses less digits than its factorization.

21552562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13352.

The product of its digits is 6000, while the sum is 28.

The square root of 21552562 is about 4642.4736940558. The cubic root of 21552562 is about 278.2913030905.

The spelling of 21552562 in words is "twenty-one million, five hundred fifty-two thousand, five hundred sixty-two".