21354546 has 8 divisors (see below), whose sum is σ = 42709104. Its totient is φ = 7118180.

The previous prime is 21354451. The next prime is 21354551. The reversal of 21354546 is 64545312.

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

21354546 is an admirable number.

It is a super-2 number, since 2×21354546² = 912033269732232, which contains 22 as substring.

It is an unprimeable number.

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, 1779540 + ... + 1779551.

It is an arithmetic number, because the mean of its divisors is an integer number (5338638).

Almost surely, 2^21354546 is an apocalyptic number.

21354546 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21354546 is a wasteful number, since it uses less digits than its factorization.

21354546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3559096.

The product of its digits is 14400, while the sum is 30.

The square root of 21354546 is about 4621.0979214901. The cubic root of 21354546 is about 277.4364045486.

Adding to 21354546 its reverse (64545312), we get a palindrome (85899858).

The spelling of 21354546 in words is "twenty-one million, three hundred fifty-four thousand, five hundred forty-six".