21323011 has 2 divisors, whose sum is σ = 21323012. Its totient is φ = 21323010.

The previous prime is 21322999. The next prime is 21323021. The reversal of 21323011 is 11032312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21323011 - 2¹³ = 21314819 is a prime.

It is a super-2 number, since 2×21323011² = 909341596212242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21322982 and 21323000.

It is not a weakly prime, because it can be changed into another prime (21323021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661505 + 10661506.

It is an arithmetic number, because the mean of its divisors is an integer number (10661506).

Almost surely, 2^21323011 is an apocalyptic number.

21323011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323011 is an equidigital number, since it uses as much as digits as its factorization.

21323011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21323011 is about 4617.6845929535. The cubic root of 21323011 is about 277.2997706099.

Adding to 21323011 its reverse (11032312), we get a palindrome (32355323).

The spelling of 21323011 in words is "twenty-one million, three hundred twenty-three thousand, eleven".