21532801 has 2 divisors, whose sum is σ = 21532802. Its totient is φ = 21532800.

The previous prime is 21532799. The next prime is 21532811. The reversal of 21532801 is 10823512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20930625 + 602176 = 4575^2 + 776^2 .

It is a cyclic number.

It is not a de Polignac number, because 21532801 - 2¹ = 21532799 is a prime.

Together with 21532799, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 3.

It is not a weakly prime, because it can be changed into another prime (21532811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10766400 + 10766401.

It is an arithmetic number, because the mean of its divisors is an integer number (10766401).

Almost surely, 2^21532801 is an apocalyptic number.

It is an amenable number.

21532801 is a deficient number, since it is larger than the sum of its proper divisors (1).

21532801 is an equidigital number, since it uses as much as digits as its factorization.

21532801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 21532801 is about 4640.3449225246. The cubic root of 21532801 is about 278.2062243262.

The spelling of 21532801 in words is "twenty-one million, five hundred thirty-two thousand, eight hundred one".