21040611 has 8 divisors (see below), whose sum is σ = 29704464. Its totient is φ = 13201920.

The previous prime is 21040601. The next prime is 21040627. The reversal of 21040611 is 11604012.

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

It is not a de Polignac number, because 21040611 - 2¹⁵ = 21007843 is a prime.

It is a super-2 number, since 2×21040611² = 885414622506642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21040601) 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, 206230 + ... + 206331.

It is an arithmetic number, because the mean of its divisors is an integer number (3713058).

Almost surely, 2^21040611 is an apocalyptic number.

21040611 is a deficient number, since it is larger than the sum of its proper divisors (8663853).

21040611 is a wasteful number, since it uses less digits than its factorization.

21040611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412581.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 21040611 is about 4587.0045781534. The cubic root of 21040611 is about 276.0701486260.

Adding to 21040611 its reverse (11604012), we get a palindrome (32644623).

The spelling of 21040611 in words is "twenty-one million, forty thousand, six hundred eleven".