21303011 has 2 divisors, whose sum is σ = 21303012. Its totient is φ = 21303010.

The previous prime is 21302993. The next prime is 21303031. The reversal of 21303011 is 11030312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21303011 - 2⁶ = 21302947 is a prime.

It is a super-2 number, since 2×21303011² = 907636555332242, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21302983 and 21303001.

It is not a weakly prime, because it can be changed into another prime (21303031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651505 + 10651506.

It is an arithmetic number, because the mean of its divisors is an integer number (10651506).

Almost surely, 2^21303011 is an apocalyptic number.

21303011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303011 is an equidigital number, since it uses as much as digits as its factorization.

21303011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 21303011 is about 4615.5184974172. The cubic root of 21303011 is about 277.2130453615.

Adding to 21303011 its reverse (11030312), we get a palindrome (32333323).

The spelling of 21303011 in words is "twenty-one million, three hundred three thousand, eleven".