21745343 has 4 divisors (see below), whose sum is σ = 21772968. Its totient is φ = 21717720.

The previous prime is 21745337. The next prime is 21745357. The reversal of 21745343 is 34354712.

It is a happy number.

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 21745343 - 2⁶ = 21745279 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 (21745543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12596 + ... + 14217.

It is an arithmetic number, because the mean of its divisors is an integer number (5443242).

Almost surely, 2^21745343 is an apocalyptic number.

21745343 is a deficient number, since it is larger than the sum of its proper divisors (27625).

21745343 is an equidigital number, since it uses as much as digits as its factorization.

21745343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27624.

The product of its digits is 10080, while the sum is 29.

The square root of 21745343 is about 4663.1902170081. The cubic root of 21745343 is about 279.1185845856.

The spelling of 21745343 in words is "twenty-one million, seven hundred forty-five thousand, three hundred forty-three".