21395033 has 4 divisors (see below), whose sum is σ = 23340048. Its totient is φ = 19450020.

The previous prime is 21395021. The next prime is 21395047. The reversal of 21395033 is 33059312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21395033 - 2⁸ = 21394777 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21394993 and 21395011.

It is not an unprimeable number, because it can be changed into a prime (21395063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 972491 + ... + 972512.

It is an arithmetic number, because the mean of its divisors is an integer number (5835012).

Almost surely, 2^21395033 is an apocalyptic number.

It is an amenable number.

21395033 is a deficient number, since it is larger than the sum of its proper divisors (1945015).

21395033 is a wasteful number, since it uses less digits than its factorization.

21395033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1945014.

The product of its (nonzero) digits is 2430, while the sum is 26.

The square root of 21395033 is about 4625.4765159927. The cubic root of 21395033 is about 277.6116283848.

The spelling of 21395033 in words is "twenty-one million, three hundred ninety-five thousand, thirty-three".