21488546 has 8 divisors (see below), whose sum is σ = 32282064. Its totient is φ = 10727860.

The previous prime is 21488543. The next prime is 21488557. The reversal of 21488546 is 64588412.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21488543) 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, 6500 + ... + 9231.

It is an arithmetic number, because the mean of its divisors is an integer number (4035258).

Almost surely, 2^21488546 is an apocalyptic number.

21488546 is a deficient number, since it is larger than the sum of its proper divisors (10793518).

21488546 is a wasteful number, since it uses less digits than its factorization.

21488546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16416.

The product of its digits is 61440, while the sum is 38.

The square root of 21488546 is about 4635.5739666195. The cubic root of 21488546 is about 278.0155004038.

The spelling of 21488546 in words is "twenty-one million, four hundred eighty-eight thousand, five hundred forty-six".