21742333 has 2 divisors, whose sum is σ = 21742334. Its totient is φ = 21742332.

The previous prime is 21742319. The next prime is 21742363. The reversal of 21742333 is 33324712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21696964 + 45369 = 4658^2 + 213^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21742333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21742298 and 21742307.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21742313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10871166 + 10871167.

It is an arithmetic number, because the mean of its divisors is an integer number (10871167).

Almost surely, 2^21742333 is an apocalyptic number.

It is an amenable number.

21742333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21742333 is an equidigital number, since it uses as much as digits as its factorization.

21742333 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 25.

The square root of 21742333 is about 4662.8674654122. The cubic root of 21742333 is about 279.1057054187.

The spelling of 21742333 in words is "twenty-one million, seven hundred forty-two thousand, three hundred thirty-three".