21046411 has 4 divisors (see below), whose sum is σ = 21334792. Its totient is φ = 20758032.

The previous prime is 21046409. The next prime is 21046429. The reversal of 21046411 is 11464012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21046411 - 2¹ = 21046409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21046111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144081 + ... + 144226.

It is an arithmetic number, because the mean of its divisors is an integer number (5333698).

Almost surely, 2^21046411 is an apocalyptic number.

21046411 is a deficient number, since it is larger than the sum of its proper divisors (288381).

21046411 is an equidigital number, since it uses as much as digits as its factorization.

21046411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288380.

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

The square root of 21046411 is about 4587.6367554548. The cubic root of 21046411 is about 276.0955132214.

It can be divided in two parts, 2104 and 6411, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 21046411 in words is "twenty-one million, forty-six thousand, four hundred eleven".