21352355 has 4 divisors (see below), whose sum is σ = 25622832. Its totient is φ = 17081880.

The previous prime is 21352343. The next prime is 21352363. The reversal of 21352355 is 55325312.

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

It is not a de Polignac number, because 21352355 - 2⁶ = 21352291 is a prime.

It is a Duffinian 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, 2135231 + ... + 2135240.

It is an arithmetic number, because the mean of its divisors is an integer number (6405708).

Almost surely, 2^21352355 is an apocalyptic number.

21352355 is a deficient number, since it is larger than the sum of its proper divisors (4270477).

21352355 is an equidigital number, since it uses as much as digits as its factorization.

21352355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4270476.

The product of its digits is 4500, while the sum is 26.

The square root of 21352355 is about 4620.8608505342. The cubic root of 21352355 is about 277.4269157969.

Adding to 21352355 its reverse (55325312), we get a palindrome (76677667).

The spelling of 21352355 in words is "twenty-one million, three hundred fifty-two thousand, three hundred fifty-five".