21026933 has 2 divisors, whose sum is σ = 21026934. Its totient is φ = 21026932.

The previous prime is 21026917. The next prime is 21026953. The reversal of 21026933 is 33962012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19864849 + 1162084 = 4457^2 + 1078^2 .

It is a cyclic number.

It is not a de Polignac number, because 21026933 - 2⁴ = 21026917 is a prime.

It is a super-2 number, since 2×21026933² = 884263822772978, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21026903) 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, 10513466 + 10513467.

It is an arithmetic number, because the mean of its divisors is an integer number (10513467).

Almost surely, 2^21026933 is an apocalyptic number.

It is an amenable number.

21026933 is a deficient number, since it is larger than the sum of its proper divisors (1).

21026933 is an equidigital number, since it uses as much as digits as its factorization.

21026933 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 21026933 is about 4585.5133845623. The cubic root of 21026933 is about 276.0103134492.

Adding to 21026933 its reverse (33962012), we get a palindrome (54988945).

The spelling of 21026933 in words is "twenty-one million, twenty-six thousand, nine hundred thirty-three".