21140633 has 2 divisors, whose sum is σ = 21140634. Its totient is φ = 21140632.

The previous prime is 21140621. The next prime is 21140663. The reversal of 21140633 is 33604112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16418704 + 4721929 = 4052^2 + 2173^2 .

It is a cyclic number.

It is not a de Polignac number, because 21140633 - 2⁶ = 21140569 is a prime.

It is not a weakly prime, because it can be changed into another prime (21140663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570316 + 10570317.

It is an arithmetic number, because the mean of its divisors is an integer number (10570317).

Almost surely, 2^21140633 is an apocalyptic number.

It is an amenable number.

21140633 is a deficient number, since it is larger than the sum of its proper divisors (1).

21140633 is an equidigital number, since it uses as much as digits as its factorization.

21140633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 21140633 is about 4597.8944094009. The cubic root of 21140633 is about 276.5069142737.

Adding to 21140633 its reverse (33604112), we get a palindrome (54744745).

The spelling of 21140633 in words is "twenty-one million, one hundred forty thousand, six hundred thirty-three".