21023235 has 12 divisors (see below), whose sum is σ = 36440352. Its totient is φ = 11212368.

The previous prime is 21023213. The next prime is 21023257. The reversal of 21023235 is 53232012.

It is an interprime number because it is at equal distance from previous prime (21023213) and next prime (21023257).

It is not a de Polignac number, because 21023235 - 2⁹ = 21022723 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 233547 + ... + 233636.

It is an arithmetic number, because the mean of its divisors is an integer number (3036696).

Almost surely, 2^21023235 is an apocalyptic number.

21023235 is a deficient number, since it is larger than the sum of its proper divisors (15417117).

21023235 is a wasteful number, since it uses less digits than its factorization.

21023235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467194 (or 467191 counting only the distinct ones).

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

The square root of 21023235 is about 4585.1101404437. The cubic root of 21023235 is about 275.9941318853.

Adding to 21023235 its reverse (53232012), we get a palindrome (74255247).

The spelling of 21023235 in words is "twenty-one million, twenty-three thousand, two hundred thirty-five".