21357833 has 8 divisors (see below), whose sum is σ = 25250880. Its totient is φ = 17675280.

The previous prime is 21357827. The next prime is 21357857. The reversal of 21357833 is 33875312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21357833 - 2¹² = 21353737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21357833.

It is not an unprimeable number, because it can be changed into a prime (21357803) 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 in 7 ways as a sum of consecutive naturals, for example, 52403 + ... + 52808.

It is an arithmetic number, because the mean of its divisors is an integer number (3156360).

Almost surely, 2^21357833 is an apocalyptic number.

It is an amenable number.

21357833 is a deficient number, since it is larger than the sum of its proper divisors (3893047).

21357833 is a wasteful number, since it uses less digits than its factorization.

21357833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105247.

The product of its digits is 15120, while the sum is 32.

The square root of 21357833 is about 4621.4535592171. The cubic root of 21357833 is about 277.4506386243.

The spelling of 21357833 in words is "twenty-one million, three hundred fifty-seven thousand, eight hundred thirty-three".