21350833 has 16 divisors (see below), whose sum is σ = 25280640. Its totient is φ = 17652096.

The previous prime is 21350809. The next prime is 21350839. The reversal of 21350833 is 33805312.

It is not a de Polignac number, because 21350833 - 2⁹ = 21350321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21350798 and 21350807.

It is not an unprimeable number, because it can be changed into a prime (21350839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26391 + ... + 27187.

It is an arithmetic number, because the mean of its divisors is an integer number (1580040).

Almost surely, 2^21350833 is an apocalyptic number.

It is an amenable number.

21350833 is a deficient number, since it is larger than the sum of its proper divisors (3929807).

21350833 is an equidigital number, since it uses as much as digits as its factorization.

21350833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 21350833 is about 4620.6961596712. The cubic root of 21350833 is about 277.4203239589.

The spelling of 21350833 in words is "twenty-one million, three hundred fifty thousand, eight hundred thirty-three".