21260933 has 4 divisors (see below), whose sum is σ = 21270348. Its totient is φ = 21251520.

The previous prime is 21260917. The next prime is 21260971. The reversal of 21260933 is 33906212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 13235044 + 8025889 = 3638^2 + 2833^2 .

It is a cyclic number.

It is not a de Polignac number, because 21260933 - 2⁴ = 21260917 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21260983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 935 + ... + 6587.

It is an arithmetic number, because the mean of its divisors is an integer number (5317587).

Almost surely, 2^21260933 is an apocalyptic number.

It is an amenable number.

21260933 is a deficient number, since it is larger than the sum of its proper divisors (9415).

21260933 is an equidigital number, since it uses as much as digits as its factorization.

21260933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9414.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 21260933 is about 4610.9579265051. The cubic root of 21260933 is about 277.0304067200.

The spelling of 21260933 in words is "twenty-one million, two hundred sixty thousand, nine hundred thirty-three".