21265933 has 6 divisors (see below), whose sum is σ = 22919694. Its totient is φ = 19614744.

The previous prime is 21265913. The next prime is 21265943. The reversal of 21265933 is 33956212.

It can be written as a sum of positive squares in only one way, i.e., 14722569 + 6543364 = 3837^2 + 2558^2 .

It is not a de Polignac number, because 21265933 - 2²¹ = 19168781 is a prime.

It is the 4612-nd Hogben number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21265895 and 21265904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21265913) by changing a digit.

It is a nontrivial repunit in base 4611.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15988 + ... + 17266.

It is an arithmetic number, because the mean of its divisors is an integer number (3819949).

Almost surely, 2^21265933 is an apocalyptic number.

It is an amenable number.

21265933 is a deficient number, since it is larger than the sum of its proper divisors (1653761).

21265933 is an frugal number, since it uses more digits than its factorization.

21265933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2571 (or 1292 counting only the distinct ones).

The product of its digits is 9720, while the sum is 31.

The square root of 21265933 is about 4611.5000813184. The cubic root of 21265933 is about 277.0521217197.

The spelling of 21265933 in words is "twenty-one million, two hundred sixty-five thousand, nine hundred thirty-three".