21144546 has 24 divisors (see below), whose sum is σ = 46051200. Its totient is φ = 7011576.

The previous prime is 21144469. The next prime is 21144547. The reversal of 21144546 is 64544112.

21144546 is a `hidden beast` number, since 2 + 114 + 4 + 546 = 666.

It is a super-2 number, since 2×21144546² = 894183651092232, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21144547) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 631 + ... + 6533.

It is an arithmetic number, because the mean of its divisors is an integer number (1918800).

Almost surely, 2^21144546 is an apocalyptic number.

21144546 is an abundant number, since it is smaller than the sum of its proper divisors (24906654).

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

21144546 is a wasteful number, since it uses less digits than its factorization.

21144546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6110 (or 6107 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 21144546 is about 4598.3199105760. The cubic root of 21144546 is about 276.5239731260.

Adding to 21144546 its reverse (64544112), we get a palindrome (85688658).

The spelling of 21144546 in words is "twenty-one million, one hundred forty-four thousand, five hundred forty-six".