21023675 has 12 divisors (see below), whose sum is σ = 26128536. Its totient is φ = 16780800.

The previous prime is 21023663. The next prime is 21023677. The reversal of 21023675 is 57632012.

It is not a de Polignac number, because 21023675 - 2⁸ = 21023419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21023677) 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 11 ways as a sum of consecutive naturals, for example, 16667 + ... + 17883.

It is an arithmetic number, because the mean of its divisors is an integer number (2177378).

Almost surely, 2^21023675 is an apocalyptic number.

21023675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21023675 is a deficient number, since it is larger than the sum of its proper divisors (5104861).

21023675 is a wasteful number, since it uses less digits than its factorization.

21023675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918 (or 1913 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 21023675 is about 4585.1581215919. The cubic root of 21023675 is about 275.9960573196.

Adding to 21023675 its reverse (57632012), we get a palindrome (78655687).

The spelling of 21023675 in words is "twenty-one million, twenty-three thousand, six hundred seventy-five".