21760133 has 2 divisors, whose sum is σ = 21760134. Its totient is φ = 21760132.

The previous prime is 21760127. The next prime is 21760159. The reversal of 21760133 is 33106712.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12802084 + 8958049 = 3578^2 + 2993^2 .

It is a cyclic number.

It is not a de Polignac number, because 21760133 - 2⁶ = 21760069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21760099 and 21760108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21760163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10880066 + 10880067.

It is an arithmetic number, because the mean of its divisors is an integer number (10880067).

Almost surely, 2^21760133 is an apocalyptic number.

It is an amenable number.

21760133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21760133 is an equidigital number, since it uses as much as digits as its factorization.

21760133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 21760133 is about 4664.7757716743. The cubic root of 21760133 is about 279.1818506728.

Adding to 21760133 its reverse (33106712), we get a palindrome (54866845).

The spelling of 21760133 in words is "twenty-one million, seven hundred sixty thousand, one hundred thirty-three".