21038343 has 4 divisors (see below), whose sum is σ = 28051128. Its totient is φ = 14025560.

The previous prime is 21038341. The next prime is 21038363. The reversal of 21038343 is 34383012.

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 21038343 - 2¹ = 21038341 is a prime.

It is a super-2 number, since 2×21038343² = 885223752371298, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21038341) 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, 3506388 + ... + 3506393.

It is an arithmetic number, because the mean of its divisors is an integer number (7012782).

Almost surely, 2^21038343 is an apocalyptic number.

21038343 is a deficient number, since it is larger than the sum of its proper divisors (7012785).

21038343 is an equidigital number, since it uses as much as digits as its factorization.

21038343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7012784.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 21038343 is about 4586.7573513322. The cubic root of 21038343 is about 276.0602289268.

The spelling of 21038343 in words is "twenty-one million, thirty-eight thousand, three hundred forty-three".