21150333 has 12 divisors (see below), whose sum is σ = 30595968. Its totient is φ = 14079240.

The previous prime is 21150331. The next prime is 21150377. The reversal of 21150333 is 33305112.

It is not a de Polignac number, because 21150333 - 2¹ = 21150331 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150331) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6868 + ... + 9458.

It is an arithmetic number, because the mean of its divisors is an integer number (2549664).

Almost surely, 2^21150333 is an apocalyptic number.

It is an amenable number.

21150333 is a deficient number, since it is larger than the sum of its proper divisors (9445635).

21150333 is a wasteful number, since it uses less digits than its factorization.

21150333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3504 (or 3501 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

The square root of 21150333 is about 4598.9491190923. The cubic root of 21150333 is about 276.5491978855.

Adding to 21150333 its reverse (33305112), we get a palindrome (54455445).

The spelling of 21150333 in words is "twenty-one million, one hundred fifty thousand, three hundred thirty-three".