21035223 has 48 divisors (see below), whose sum is σ = 35717760. Its totient is φ = 11793600.

The previous prime is 21035219. The next prime is 21035227. The reversal of 21035223 is 32253012.

It is an interprime number because it is at equal distance from previous prime (21035219) and next prime (21035227).

It is not a de Polignac number, because 21035223 - 2² = 21035219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21035196 and 21035205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 99588 + ... + 99798.

It is an arithmetic number, because the mean of its divisors is an integer number (744120).

Almost surely, 2^21035223 is an apocalyptic number.

21035223 is a deficient number, since it is larger than the sum of its proper divisors (14682537).

21035223 is a wasteful number, since it uses less digits than its factorization.

21035223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300 (or 297 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 21035223 is about 4586.4172291670. The cubic root of 21035223 is about 276.0465816148.

Adding to 21035223 its reverse (32253012), we get a palindrome (53288235).

The spelling of 21035223 in words is "twenty-one million, thirty-five thousand, two hundred twenty-three".