21441013 has 8 divisors (see below), whose sum is σ = 23787360. Its totient is φ = 19160880.

The previous prime is 21441011. The next prime is 21441031. The reversal of 21441013 is 31014412.

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 21441013 - 2¹ = 21441011 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 (21441011) 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, 15870 + ... + 17167.

It is an arithmetic number, because the mean of its divisors is an integer number (2973420).

Almost surely, 2^21441013 is an apocalyptic number.

It is an amenable number.

21441013 is a deficient number, since it is larger than the sum of its proper divisors (2346347).

21441013 is a wasteful number, since it uses less digits than its factorization.

21441013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33107.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21441013 is about 4630.4441471634. Note that the first 3 decimals coincide. The cubic root of 21441013 is about 277.8103575239.

Adding to 21441013 its reverse (31014412), we get a palindrome (52455425).

The spelling of 21441013 in words is "twenty-one million, four hundred forty-one thousand, thirteen".