21023410 has 8 divisors (see below), whose sum is σ = 37842156. Its totient is φ = 8409360.

The previous prime is 21023393. The next prime is 21023413. The reversal of 21023410 is 1432012.

It can be written as a sum of positive squares in 2 ways, for example, as 20967241 + 56169 = 4579^2 + 237^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21023413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051161 + ... + 1051180.

Almost surely, 2^21023410 is an apocalyptic number.

21023410 is a deficient number, since it is larger than the sum of its proper divisors (16818746).

21023410 is a wasteful number, since it uses less digits than its factorization.

21023410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102348.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21023410 is about 4585.1292239151. The cubic root of 21023410 is about 275.9948976863.

Adding to 21023410 its reverse (1432012), we get a palindrome (22455422).

The spelling of 21023410 in words is "twenty-one million, twenty-three thousand, four hundred ten".