21760633 has 2 divisors, whose sum is σ = 21760634. Its totient is φ = 21760632.

The previous prime is 21760619. The next prime is 21760639. The reversal of 21760633 is 33606712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21650409 + 110224 = 4653^2 + 332^2 .

It is a cyclic number.

It is not a de Polignac number, because 21760633 - 2¹⁷ = 21629561 is a prime.

It is not a weakly prime, because it can be changed into another prime (21760639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10880316 + 10880317.

It is an arithmetic number, because the mean of its divisors is an integer number (10880317).

Almost surely, 2^21760633 is an apocalyptic number.

It is an amenable number.

21760633 is a deficient number, since it is larger than the sum of its proper divisors (1).

21760633 is an equidigital number, since it uses as much as digits as its factorization.

21760633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 21760633 is about 4664.8293645106. The cubic root of 21760633 is about 279.1839889848.

The spelling of 21760633 in words is "twenty-one million, seven hundred sixty thousand, six hundred thirty-three".