21546049 has 8 divisors (see below), whose sum is σ = 24842880. Its totient is φ = 18303936.

The previous prime is 21546047. The next prime is 21546067. The reversal of 21546049 is 94064512.

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

It is not a de Polignac number, because 21546049 - 2¹ = 21546047 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21546049.

It is not an unprimeable number, because it can be changed into a prime (21546047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12829 + ... + 14410.

It is an arithmetic number, because the mean of its divisors is an integer number (3105360).

Almost surely, 2^21546049 is an apocalyptic number.

It is an amenable number.

21546049 is a deficient number, since it is larger than the sum of its proper divisors (3296831).

21546049 is a wasteful number, since it uses less digits than its factorization.

21546049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27359.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 21546049 is about 4641.7721831214. The cubic root of 21546049 is about 278.2632678487.

It can be divided in two parts, 215 and 46049, that added together give a palindrome (46264).

The spelling of 21546049 in words is "twenty-one million, five hundred forty-six thousand, forty-nine".