21023301 has 16 divisors (see below), whose sum is σ = 31162880. Its totient is φ = 12519360.

The previous prime is 21023287. The next prime is 21023309. The reversal of 21023301 is 10332012.

It is a happy number.

It is not a de Polignac number, because 21023301 - 2⁵ = 21023269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7486 + ... + 9903.

It is an arithmetic number, because the mean of its divisors is an integer number (1947680).

Almost surely, 2^21023301 is an apocalyptic number.

It is an amenable number.

21023301 is a deficient number, since it is larger than the sum of its proper divisors (10139579).

21023301 is a wasteful number, since it uses less digits than its factorization.

21023301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17436.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 21023301 is about 4585.1173376480. The cubic root of 21023301 is about 275.9944207022.

Adding to 21023301 its reverse (10332012), we get a palindrome (31355313).

The spelling of 21023301 in words is "twenty-one million, twenty-three thousand, three hundred one".