21044051 has 8 divisors (see below), whose sum is σ = 24172800. Its totient is φ = 17945928.

The previous prime is 21044047. The next prime is 21044059. The reversal of 21044051 is 15044012.

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

It is not a de Polignac number, because 21044051 - 2² = 21044047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21044059) 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 7 ways as a sum of consecutive naturals, for example, 6161 + ... + 8946.

It is an arithmetic number, because the mean of its divisors is an integer number (3021600).

Almost surely, 2^21044051 is an apocalyptic number.

21044051 is a deficient number, since it is larger than the sum of its proper divisors (3128749).

21044051 is a wasteful number, since it uses less digits than its factorization.

21044051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15313.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21044051 is about 4587.3795352031. The cubic root of 21044051 is about 276.0851930174.

Adding to 21044051 its reverse (15044012), we get a palindrome (36088063).

The spelling of 21044051 in words is "twenty-one million, forty-four thousand, fifty-one".