21532633 has 2 divisors, whose sum is σ = 21532634. Its totient is φ = 21532632.

The previous prime is 21532619. The next prime is 21532663. The reversal of 21532633 is 33623512.

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., 15116544 + 6416089 = 3888^2 + 2533^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21532633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21532598 and 21532607.

It is not a weakly prime, because it can be changed into another prime (21532603) 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, 10766316 + 10766317.

It is an arithmetic number, because the mean of its divisors is an integer number (10766317).

Almost surely, 2^21532633 is an apocalyptic number.

It is an amenable number.

21532633 is a deficient number, since it is larger than the sum of its proper divisors (1).

21532633 is an equidigital number, since it uses as much as digits as its factorization.

21532633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 25.

The square root of 21532633 is about 4640.3268203867. The cubic root of 21532633 is about 278.2055007980.

The spelling of 21532633 in words is "twenty-one million, five hundred thirty-two thousand, six hundred thirty-three".