21040041 has 32 divisors (see below), whose sum is σ = 32034816. Its totient is φ = 12168000.

The previous prime is 21040039. The next prime is 21040043. The reversal of 21040041 is 14004012.

It is an interprime number because it is at equal distance from previous prime (21040039) and next prime (21040043).

It is not a de Polignac number, because 21040041 - 2¹ = 21040039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21039999 and 21040026.

It is not an unprimeable number, because it can be changed into a prime (21040043) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 133935 + ... + 134091.

It is an arithmetic number, because the mean of its divisors is an integer number (1001088).

Almost surely, 2^21040041 is an apocalyptic number.

It is an amenable number.

21040041 is a deficient number, since it is larger than the sum of its proper divisors (10994775).

21040041 is a wasteful number, since it uses less digits than its factorization.

21040041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 21040041 is about 4586.9424456821. The cubic root of 21040041 is about 276.0676556470.

Adding to 21040041 its reverse (14004012), we get a palindrome (35044053).

The spelling of 21040041 in words is "twenty-one million, forty thousand, forty-one".