21144061 has 8 divisors (see below), whose sum is σ = 22394304. Its totient is φ = 19921440.

The previous prime is 21144059. The next prime is 21144083. The reversal of 21144061 is 16044112.

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

It is a cyclic number.

It is not a de Polignac number, because 21144061 - 2¹ = 21144059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144661) 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 7 ways as a sum of consecutive naturals, for example, 5320 + ... + 8401.

It is an arithmetic number, because the mean of its divisors is an integer number (2799288).

Almost surely, 2^21144061 is an apocalyptic number.

It is an amenable number.

21144061 is a deficient number, since it is larger than the sum of its proper divisors (1250243).

21144061 is a wasteful number, since it uses less digits than its factorization.

21144061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13811.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 21144061 is about 4598.2671736210. The cubic root of 21144061 is about 276.5218588668.

Adding to 21144061 its reverse (16044112), we get a palindrome (37188173).

The spelling of 21144061 in words is "twenty-one million, one hundred forty-four thousand, sixty-one".