21343933 has 4 divisors (see below), whose sum is σ = 22985788. Its totient is φ = 19702080.

The previous prime is 21343919. The next prime is 21343937. The reversal of 21343933 is 33934312.

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 11471769 + 9872164 = 3387^2 + 3142^2 .

It is a cyclic number.

It is not a de Polignac number, because 21343933 - 2⁵ = 21343901 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 (21343937) 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, 820908 + ... + 820933.

It is an arithmetic number, because the mean of its divisors is an integer number (5746447).

Almost surely, 2^21343933 is an apocalyptic number.

It is an amenable number.

21343933 is a deficient number, since it is larger than the sum of its proper divisors (1641855).

21343933 is a wasteful number, since it uses less digits than its factorization.

21343933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641854.

The product of its digits is 5832, while the sum is 28.

The square root of 21343933 is about 4619.9494585980. The cubic root of 21343933 is about 277.3904358747.

The spelling of 21343933 in words is "twenty-one million, three hundred forty-three thousand, nine hundred thirty-three".