21343055 has 4 divisors (see below), whose sum is σ = 25611672. Its totient is φ = 17074440.

The previous prime is 21343039. The next prime is 21343111. The reversal of 21343055 is 55034312.

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

It is not a de Polignac number, because 21343055 - 2⁴ = 21343039 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21343055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2134301 + ... + 2134310.

It is an arithmetic number, because the mean of its divisors is an integer number (6402918).

Almost surely, 2^21343055 is an apocalyptic number.

21343055 is a deficient number, since it is larger than the sum of its proper divisors (4268617).

21343055 is an equidigital number, since it uses as much as digits as its factorization.

21343055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4268616.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 21343055 is about 4619.8544349362. The cubic root of 21343055 is about 277.3866322624.

Adding to 21343055 its reverse (55034312), we get a palindrome (76377367).

The spelling of 21343055 in words is "twenty-one million, three hundred forty-three thousand, fifty-five".