21634733 has 2 divisors, whose sum is σ = 21634734. Its totient is φ = 21634732.

The previous prime is 21634729. The next prime is 21634741. The reversal of 21634733 is 33743612.

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., 21557449 + 77284 = 4643^2 + 278^2 .

It is a cyclic number.

It is not a de Polignac number, because 21634733 - 2² = 21634729 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21634696 and 21634705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21634133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10817366 + 10817367.

It is an arithmetic number, because the mean of its divisors is an integer number (10817367).

Almost surely, 2^21634733 is an apocalyptic number.

It is an amenable number.

21634733 is a deficient number, since it is larger than the sum of its proper divisors (1).

21634733 is an equidigital number, since it uses as much as digits as its factorization.

21634733 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 29.

The square root of 21634733 is about 4651.3151903521. The cubic root of 21634733 is about 278.6445244331.

The spelling of 21634733 in words is "twenty-one million, six hundred thirty-four thousand, seven hundred thirty-three".