21003301 has 12 divisors (see below), whose sum is σ = 24093216. Its totient is φ = 18261320.

The previous prime is 21003299. The next prime is 21003329. The reversal of 21003301 is 10330012.

It is not a de Polignac number, because 21003301 - 2¹ = 21003299 is a prime.

It is a super-2 number, since 2×21003301² = 882277305793202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003331) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 991 + ... + 6556.

It is an arithmetic number, because the mean of its divisors is an integer number (2007768).

Almost surely, 2^21003301 is an apocalyptic number.

It is an amenable number.

21003301 is a deficient number, since it is larger than the sum of its proper divisors (3089915).

21003301 is a wasteful number, since it uses less digits than its factorization.

21003301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7592 (or 7581 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 21003301 is about 4582.9358494310. The cubic root of 21003301 is about 275.9068727676.

Adding to 21003301 its reverse (10330012), we get a palindrome (31333313).

Subtracting from 21003301 its reverse (10330012), we obtain a square (10673289 = 3267²).

The spelling of 21003301 in words is "twenty-one million, three thousand, three hundred one".