21343355 has 16 divisors (see below), whose sum is σ = 28060128. Its totient is φ = 15456000.

The previous prime is 21343337. The next prime is 21343363. The reversal of 21343355 is 55334312.

It is not a de Polignac number, because 21343355 - 2¹⁰ = 21342331 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14765 + ... + 16145.

It is an arithmetic number, because the mean of its divisors is an integer number (1753758).

Almost surely, 2^21343355 is an apocalyptic number.

21343355 is a deficient number, since it is larger than the sum of its proper divisors (6716773).

21343355 is a wasteful number, since it uses less digits than its factorization.

21343355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678.

The product of its digits is 5400, while the sum is 26.

The square root of 21343355 is about 4619.8869033776. The cubic root of 21343355 is about 277.3879319139.

Adding to 21343355 its reverse (55334312), we get a palindrome (76677667).

The spelling of 21343355 in words is "twenty-one million, three hundred forty-three thousand, three hundred fifty-five".