21341533 has 2 divisors, whose sum is σ = 21341534. Its totient is φ = 21341532.

The previous prime is 21341531. The next prime is 21341543. The reversal of 21341533 is 33514312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11437924 + 9903609 = 3382^2 + 3147^2 .

It is a cyclic number.

It is not a de Polignac number, because 21341533 - 2¹ = 21341531 is a prime.

It is a super-2 number, since 2×21341533² = 910922061580178, which contains 22 as substring.

Together with 21341531, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21341531) 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, 10670766 + 10670767.

It is an arithmetic number, because the mean of its divisors is an integer number (10670767).

Almost surely, 2^21341533 is an apocalyptic number.

It is an amenable number.

21341533 is a deficient number, since it is larger than the sum of its proper divisors (1).

21341533 is an equidigital number, since it uses as much as digits as its factorization.

21341533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 22.

The square root of 21341533 is about 4619.6897081947. The cubic root of 21341533 is about 277.3800385095.

Adding to 21341533 its reverse (33514312), we get a palindrome (54855845).

The spelling of 21341533 in words is "twenty-one million, three hundred forty-one thousand, five hundred thirty-three".