21336941 has 4 divisors (see below), whose sum is σ = 21386652. Its totient is φ = 21287232.

The previous prime is 21336907. The next prime is 21336961. The reversal of 21336941 is 14963312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8584900 + 12752041 = 2930^2 + 3571^2 .

It is a cyclic number.

It is not a de Polignac number, because 21336941 - 2¹⁴ = 21320557 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 (21336961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24206 + ... + 25071.

It is an arithmetic number, because the mean of its divisors is an integer number (5346663).

Almost surely, 2^21336941 is an apocalyptic number.

It is an amenable number.

21336941 is a deficient number, since it is larger than the sum of its proper divisors (49711).

21336941 is an equidigital number, since it uses as much as digits as its factorization.

21336941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49710.

The product of its digits is 3888, while the sum is 29.

The square root of 21336941 is about 4619.1926783801. The cubic root of 21336941 is about 277.3601427113.

The spelling of 21336941 in words is "twenty-one million, three hundred thirty-six thousand, nine hundred forty-one".