21338043 has 16 divisors (see below), whose sum is σ = 31435776. Its totient is φ = 12805760.

The previous prime is 21338039. The next prime is 21338059. The reversal of 21338043 is 34083312.

It is not a de Polignac number, because 21338043 - 2² = 21338039 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21338003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7923 + ... + 10268.

It is an arithmetic number, because the mean of its divisors is an integer number (1964736).

Almost surely, 2^21338043 is an apocalyptic number.

21338043 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21338043 is a deficient number, since it is larger than the sum of its proper divisors (10097733).

21338043 is a wasteful number, since it uses less digits than its factorization.

21338043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18234.

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

The square root of 21338043 is about 4619.3119617536. The cubic root of 21338043 is about 277.3649176166.

The spelling of 21338043 in words is "twenty-one million, three hundred thirty-eight thousand, forty-three".