21146933 has 4 divisors (see below), whose sum is σ = 21334188. Its totient is φ = 20959680.

The previous prime is 21146921. The next prime is 21146953. The reversal of 21146933 is 33964112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 289444 + 20857489 = 538^2 + 4567^2 .

It is a cyclic number.

It is not a de Polignac number, because 21146933 - 2¹⁶ = 21081397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21146896 and 21146905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21146903) 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, 93458 + ... + 93683.

It is an arithmetic number, because the mean of its divisors is an integer number (5333547).

Almost surely, 2^21146933 is an apocalyptic number.

It is an amenable number.

21146933 is a deficient number, since it is larger than the sum of its proper divisors (187255).

21146933 is a wasteful number, since it uses less digits than its factorization.

21146933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187254.

The product of its digits is 3888, while the sum is 29.

The square root of 21146933 is about 4598.5794545707. The cubic root of 21146933 is about 276.5343782976.

The spelling of 21146933 in words is "twenty-one million, one hundred forty-six thousand, nine hundred thirty-three".