21056033 has 2 divisors, whose sum is σ = 21056034. Its totient is φ = 21056032.

The previous prime is 21056029. The next prime is 21056039. The reversal of 21056033 is 33065012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20178064 + 877969 = 4492^2 + 937^2 .

It is a cyclic number.

It is not a de Polignac number, because 21056033 - 2² = 21056029 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21055996 and 21056014.

It is not a weakly prime, because it can be changed into another prime (21056039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10528016 + 10528017.

It is an arithmetic number, because the mean of its divisors is an integer number (10528017).

Almost surely, 2^21056033 is an apocalyptic number.

It is an amenable number.

21056033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21056033 is an equidigital number, since it uses as much as digits as its factorization.

21056033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 21056033 is about 4588.6853237066. The cubic root of 21056033 is about 276.1375819346.

The spelling of 21056033 in words is "twenty-one million, fifty-six thousand, thirty-three".