21057333 has 16 divisors (see below), whose sum is σ = 30868992. Its totient is φ = 12662000.

The previous prime is 21057331. The next prime is 21057341. The reversal of 21057333 is 33375012.

It is a cyclic number.

It is not a de Polignac number, because 21057333 - 2¹ = 21057331 is a prime.

It is a super-2 number, since 2×21057333² = 886822546145778, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21057331) 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, 1888 + ... + 6758.

It is an arithmetic number, because the mean of its divisors is an integer number (1929312).

Almost surely, 2^21057333 is an apocalyptic number.

It is an amenable number.

21057333 is a deficient number, since it is larger than the sum of its proper divisors (9811659).

21057333 is a wasteful number, since it uses less digits than its factorization.

21057333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5016.

The product of its (nonzero) digits is 1890, while the sum is 24.

The square root of 21057333 is about 4588.8269742931. The cubic root of 21057333 is about 276.1432647314.

The spelling of 21057333 in words is "twenty-one million, fifty-seven thousand, three hundred thirty-three".