21041641 has 8 divisors (see below), whose sum is σ = 21667904. Its totient is φ = 20418480.

The previous prime is 21041639. The next prime is 21041659. The reversal of 21041641 is 14614012.

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 21041641 - 2¹ = 21041639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21041621) 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, 25156 + ... + 25978.

It is an arithmetic number, because the mean of its divisors is an integer number (2708488).

Almost surely, 2^21041641 is an apocalyptic number.

It is an amenable number.

21041641 is a deficient number, since it is larger than the sum of its proper divisors (626263).

21041641 is an equidigital number, since it uses as much as digits as its factorization.

21041641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1551.

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

The square root of 21041641 is about 4587.1168504846. The cubic root of 21041641 is about 276.0746533687.

Adding to 21041641 its reverse (14614012), we get a palindrome (35655653).

The spelling of 21041641 in words is "twenty-one million, forty-one thousand, six hundred forty-one".